20 Scientific Experiments Students Can Try at Home

Children often come across science experiments in school, but many of those activities can be repeated at home. A few need nothing more than items already available in the kitchen or study room. Students can try them during weekends, holidays or as part of a school assignment. The experiments below include simple activities involving plants, water, air, light, magnets and everyday materials.

20 Scientific Experiments Students Can Try at Home

Try these simple activities using everyday materials and discover the science behind each experiment.

1. Make a Baking Soda and Vinegar Volcano

Make a small volcano at home and watch it bubble over when baking soda and vinegar are mixed. This activity demonstrates a chemical reaction that produces carbon dioxide gas.

Materials Required

• 2 tablespoons of baking soda
• ½ cup of vinegar
• Small plastic bottle or container
• Tray or large plate
• Modelling clay or paper for shaping a volcano (optional)
• Food colouring (optional)

Steps to Follow

1. Place the small bottle upright in the centre of a tray.
2. Shape modelling clay or paper around it to give it a volcano-like appearance, keeping the opening clear.
3. Add two tablespoons of baking soda to the bottle.
4. Mix a few drops of food colouring with the vinegar, if desired.
5. Pour the vinegar into the bottle and watch the mixture bubble and flow out.

What Will You Observe?

As soon as vinegar enters the bottle, bubbles and foam begin to rise and spill over the sides. The mixture may look like lava flowing down a volcano. The reaction usually settles after a short time as the ingredients are used up.

Science Behind It

Baking soda is a base, while vinegar contains acetic acid. When they come into contact, they react and produce carbon dioxide gas, water and sodium acetate. The carbon dioxide forms bubbles that push the liquid upwards, creating the foamy eruption. This is a simple example of an acid-base reaction.

3. Make a Walking Water Rainbow

Six glasses, coloured water and a few paper towel strips are enough for this experiment. Students can watch water move through the paper and see how mixing primary colours produces new colours in the empty glasses.

Materials Required

• 6 clear drinking glasses
• Water
• Red, yellow and blue food colours
• Paper towels or kitchen tissue

Steps to Follow

1. Set up six glasses in a row.
2. Add water to the first, third and fifth glasses, filling each about three-quarters full.
3. Put red food colouring in the first glass, yellow in the third and blue in the fifth.
4. Keep the second, fourth and sixth glasses empty.
5. Fold paper towels into strips and place them between neighbouring glasses, connecting each pair.
6. Push the ends of the paper strips into the water so they remain in contact with the liquid.
7. Leave the arrangement in place and observe the changes over the next few hours.

What Will You Observe?

Water gradually climbs through the paper strips and drips into the empty glasses. The colours begin to spread into these glasses and combine with one another. You should see orange, green and purple forming as the experiment progresses.

Science Behind It

The movement of water through the paper is called capillary action. The tiny spaces between the paper fibres allow water to move through them. Water molecules are attracted to the fibres and to other water molecules, helping the liquid travel along the strips. The colour changes happen because red, yellow and blue food colouring mix when the liquids meet.

4. Build a Balloon-Powered Car

Make a small four-wheeled car and see how far it can travel using air from a balloon. The activity combines a simple construction project with a lesson about forces, motion and the way air pressure can create movement.

Materials Required

• Lightweight cardboard for the car base
• 4 bottle caps
• 2 wooden skewers
• 2 drinking straws for the axles
• 1 balloon
• 1 narrow straw for releasing air
• Tape and rubber bands

Steps to Follow

1. Cut a rectangular piece of cardboard to make the base of the car.
2. Attach two straw sections underneath the base, keeping them parallel.
3. Insert the wooden skewers through the straws.
4. Make holes in the bottle caps and attach them to the ends of the skewers to create four wheels.
5. Connect the balloon to the narrow straw using a rubber band so air cannot escape around the opening.
6. Secure the balloon and straw on top of the car with tape. Point the straw towards the rear.
7. Blow into the straw to inflate the balloon, then hold the straw opening closed.
8. Set the car on a flat surface and let go of the opening.

What Will You Observe?

The car moves forward as the air leaves the balloon. If the wheels are uneven or the car body is too heavy, it may not travel very far. A smooth floor usually gives better results than a rough surface.

Science Behind It

The balloon stores air under pressure. When the opening is released, the air rushes backwards through the straw. This produces a reaction force in the opposite direction, pushing the car forward. The principle is the same one that explains how rockets move by releasing gases at high speed.

5. Make a Floating Egg

One egg, two glasses and some salt are all you need for this activity. The egg behaves differently in each glass, even though nothing about the egg itself changes. The reason lies in the density of the liquid surrounding it.

Materials Required

• 1 raw egg
• 2 clear glasses
• Water
• Salt (about 5 tablespoons or more, as needed)
• Spoon for stirring

Steps to Follow

1. Fill two glasses with equal quantities of water.
2. Add salt to one glass, a spoonful at a time.
3. Stir after each addition to dissolve the salt.
4. Place the egg gently into the glass of plain water.
5. Notice whether it sinks or stays near the surface.
6. Move the egg to the saltwater glass and watch its movement.
7. If it does not float, add a little more salt, stir and try again.

What Will You Observe?

The egg sinks in the plain water but rises in the saltwater solution. As more salt dissolves, the water becomes denser and the egg can float closer to the surface.

Science Behind It

This activity demonstrates density and buoyancy. Density refers to the amount of mass in a given volume. Salt makes the water heavier for the same volume, increasing its density. Once the saltwater is denser than the egg, the liquid can provide enough buoyant force to keep it afloat.

6. Grow Crystals Using Salt

Students can make their own salt crystals with a few kitchen supplies and a place to leave the solution undisturbed. Unlike experiments that show an instant reaction, this one changes slowly. Checking the dish each day gives students a chance to see how crystals develop.

Materials Required

• ½ cup of warm water
• Salt
• Small glass jar
• Spoon for stirring
• Shallow bowl
• Magnifying glass (optional)

Steps to Follow

1. Ask an adult to help prepare a cup of warm water.
2. Stir salt into the water until it dissolves.
3. Add more salt until a small amount no longer dissolves.
4. Pour the solution into a shallow bowl without transferring the undissolved salt.
5. Keep the bowl in a dry place where it can remain undisturbed.
6. Observe the solution every day for about a week.
7. Once the water has evaporated, examine the salt crystals left in the bowl.

What Will You Observe?

At first, the dish contains only clear saltwater. After some time, tiny crystals begin forming, especially around the edges. More crystals appear as the water evaporates, leaving a layer of salt behind.

Science Behind It

A solution can hold only a certain amount of dissolved salt at a particular temperature. When water evaporates, the amount of liquid decreases while the salt remains. Eventually, the remaining solution becomes too concentrated to keep all the salt dissolved. The extra salt forms crystals through a process called crystallisation.

7. Make a Homemade Lava Lamp

Watch coloured blobs move up and down inside a bottle without using electricity. Oil, water and an effervescent tablet create the movement, making this a simple way to explore density and gas bubbles.

Materials Required

• 1 transparent plastic bottle or tall glass
• Water
• Vegetable oil
• Food colouring
• 1 effervescent tablet (such as an antacid tablet)

Steps to Follow

1. Fill about one-quarter of the bottle with water.
2. Pour vegetable oil into the bottle, leaving some space at the top.
3. Wait until the oil and water form two separate layers.
4. Add a few drops of food colouring and allow them to pass through the oil into the water.
5. Break an effervescent tablet into smaller pieces.
6. Drop one piece into the bottle and watch the coloured bubbles move.
7. Add another piece when the bubbling stops to repeat the effect.

What Will You Observe?

Coloured bubbles rise through the oil and then sink back towards the water layer. This movement continues while the tablet produces gas. Once the bubbling stops, the liquids settle into separate layers again.

Science Behind It

Oil and water do not mix because they have different chemical properties. Oil is also less dense than water, so it stays on top. The tablet reacts with water and releases carbon dioxide gas. These gas bubbles attach to small amounts of coloured water and carry them upwards. When the gas escapes at the surface, the coloured water sinks back down.

8. Separate Pepper from Water Using Soap

Black pepper sprinkled over water appears to move away quickly when a soapy finger touches the surface. This small kitchen experiment shows how soap changes the surface tension of water.

Materials Required

• 1 shallow plate or bowl
• Water
• Ground black pepper
• Liquid dish soap
• A cotton bud (optional)

Steps to Follow

1. Pour enough water into the plate to cover its bottom.
2. Sprinkle a thin layer of ground black pepper over the water.
3. Put a small drop of dish soap on your fingertip or on the end of a cotton bud.
4. Gently touch the centre of the water surface.
5. Watch how the pepper moves away from the point of contact.
6. Repeat the activity with fresh water to see the effect again.

What Will You Observe?

The pepper quickly moves towards the edges of the plate, leaving a clearer area around the soapy fingertip. The movement happens almost immediately after the soap touches the water.

Science Behind It

Water molecules attract one another, creating surface tension at the top of the liquid. Soap reduces this surface tension where it touches the water. The difference between the surface tension in the soapy area and the surrounding water causes the liquid to move away from the soap. The floating pepper particles are carried along with it.

9. Create a Static Electricity Balloon

A balloon rubbed against dry hair can attract small pieces of paper or make hair stand up. Students can try this simple activity to see how an object gains an electric charge through friction.

Materials Required

• 1 inflated balloon
• Small pieces of paper
• Dry hair or a woollen cloth
• A smooth wall (optional)

Steps to Follow

1. Inflate the balloon and tie its opening securely.
2. Tear a sheet of paper into several tiny pieces and spread them on a table.
3. Rub the balloon against dry hair or a woollen cloth for about 20 seconds.
4. Hold the balloon close to the paper pieces without touching them.
5. Observe how the paper reacts.
6. You can also place the rubbed balloon gently against a clean wall and see whether it stays there briefly.

What Will You Observe?

The small paper pieces jump towards the balloon and may stick to its surface. When held against a wall, the balloon may remain in place for a short time before falling. The effect is usually easier to notice in dry weather.

Science Behind It

Rubbing the balloon against hair or wool transfers electrons from one material to another. This leaves the balloon with an electric charge. Its charge attracts nearby neutral objects, such as paper pieces, by causing a small shift in their electric charges. This effect is called static electricity.

10. Make a Paper Bridge and Test Its Strength

A flat sheet of paper may bend under the weight of a few coins, but folding it into a different shape can make it much stronger. Students can build a small paper bridge and test how its design affects the weight it can support.

Materials Required

• 3 sheets of paper
• 2 equal-height stacks of books
• Coins or small weights
• A ruler
• Adhesive tape (optional)

Steps to Follow

1. Place two stacks of books a short distance apart to act as bridge supports.
2. Lay one sheet of paper flat across the gap.
3. Add coins one at a time to the centre and count how many it holds before bending.
4. Remove the coins and fold another sheet of paper into a concertina or accordion shape.
5. Place the folded paper across the same gap.
6. Add coins slowly and record how many it supports.
7. Try rolling the third sheet into a tube and repeat the test.

What Will You Observe?

The flat paper bends more easily, while the folded or rolled paper may hold a larger number of coins. Different shapes distribute the weight in different ways, changing how much force the paper can withstand.

Science Behind It

This activity introduces structural strength and load distribution. Folding or rolling paper changes its shape and increases its resistance to bending. The weight is spread across the structure rather than concentrated on one flat surface. Engineers use similar principles when designing bridges, roofs and other structures.

11. Observe Water Movement in Celery

Place a celery stalk in coloured water and watch its leaves and stem change over time. The colour travels through tiny tubes inside the plant, giving students a chance to observe how water moves from the roots towards the leaves.

Materials Required

• 1 fresh celery stalk with leaves
• 1 transparent glass
• Water
• Food colouring (red or blue works well)
• A knife (adult supervision required)

Steps to Follow

1. Fill the glass halfway with water.
2. Add several drops of food colouring and stir.
3. Ask an adult to trim the bottom of the celery stalk.
4. Place the cut end of the celery in the coloured water.
5. Keep the glass in a place where it will not be disturbed.
6. Check the stalk and leaves after a few hours, and again the next day.
7. With adult help, cut across the stalk to look for coloured spots inside it.

What Will You Observe?

Coloured lines may appear along the celery stalk, and the leaf veins may gradually take on the colour of the water. When the stalk is cut, small coloured dots can often be seen inside it. The changes become clearer after several hours.

Science Behind It

Plants transport water through tiny tubes called xylem vessels. Water moves upwards through these vessels due to capillary action, cohesion between water molecules and transpiration from the leaves. The food colouring travels along with the water, making the pathway visible.

12. Make a Simple Water Filter

Dirty water can contain visible particles such as sand and soil. Students can build a basic filter using a plastic bottle and layers of different materials to see how some of these particles can be removed.

Materials Required

• 1 empty plastic bottle
• Cotton or clean cloth
• Clean gravel or small stones
• Coarse sand
• Fine sand
• Scissors (adult supervision required)
• A container to collect the filtered water
• Water mixed with a little clean soil

Steps to Follow

1. Ask an adult to cut the bottom off the plastic bottle.
2. Turn the bottle upside down so its opening faces downwards.
3. Place cotton or a clean piece of cloth near the bottle opening.
4. Add a layer of fine sand, followed by coarse sand and gravel.
5. Place the bottle over an empty container to collect the water.
6. Slowly pour the soil-water mixture through the filter.
7. Observe the water collected in the container and compare it with the original mixture.

What Will You Observe?

The water passes through the different layers and collects below. Large pieces of dirt and some smaller particles get trapped in the filter materials. The collected water may look clearer than the original mixture, although it may still contain germs and dissolved substances.

Science Behind It

This experiment demonstrates filtration, a method used to separate suspended solid particles from a liquid. Gravel, sand and cloth trap particles of different sizes as water passes through them. However, a homemade filter cannot make unsafe water suitable for drinking. It does not reliably remove harmful microorganisms, chemicals or dissolved contaminants.

13. Test Which Objects Are Magnetic

A magnet can attract some objects while leaving others untouched, even when they are made of metal. Students can test items around the house and make a list of materials that respond to a magnet.

Materials Required

• 1 bar magnet or refrigerator magnet
• Paper clips
• Iron nail
• Steel spoon
• Aluminium foil
• Plastic ruler
• Wooden pencil
• Coins made from different metals
• Notebook and pencil

Steps to Follow

1. Collect the objects and place them on a table.
2. Hold the magnet close to the first object without touching it.
3. Check whether the object moves towards the magnet or stays in place.
4. Repeat the test with every item.
5. Record the results in two groups: objects attracted to the magnet and objects not attracted to it.
6. Compare the results and look for similarities between the materials.

What Will You Observe?

The magnet attracts objects such as iron nails and many steel paper clips. Plastic, wood and aluminium usually show no attraction. Some coins may respond differently depending on the metals used to make them.

Science Behind It

Magnetism is a force produced by moving electric charges and the magnetic properties of materials. Iron, nickel, cobalt and many of their alloys are attracted to magnets. These materials are called ferromagnetic materials. Not every metal is magnetic, which is why aluminium and copper do not behave like iron near an ordinary magnet.

14. Make an Invisible Ink Message

Write a secret message using lemon juice and watch it appear when the paper is gently warmed. This activity demonstrates how certain substances change colour when exposed to heat and oxygen.

Materials Required

• 1 lemon
• Small bowl
• White paper
• Cotton bud or small paintbrush
• Adult-supervised warm iron or another safe heat source

Steps to Follow

1. Squeeze some lemon juice into a small bowl.
2. Dip a cotton bud or paintbrush into the juice.
3. Write a short message or draw a picture on white paper.
4. Allow the paper to dry completely until the writing is difficult to see.
5. Ask an adult to gently warm the paper using a low-temperature iron, keeping it moving and never leaving it unattended.
6. Watch the hidden writing gradually turn brown and become visible.

What Will You Observe?

The dried lemon juice is almost invisible on the paper. When the paper is gently warmed, the areas containing lemon juice gradually become brown, revealing the hidden message.

Science Behind It

Lemon juice contains organic compounds that can oxidise and break down when heated. These changes cause the areas containing the juice to darken faster than the surrounding paper. This makes the writing visible. The activity demonstrates how heat can speed up certain chemical changes.

15. Build a Simple Straw Flute

A drinking straw can be turned into a small musical instrument that produces sound when air passes through it. By changing the length of the straw, students can hear how the pitch of a note changes.

Materials Required

• 1 wide drinking straw
• Scissors
• Ruler

Steps to Follow

1. Flatten about 2 cm of one end of the straw.
2. Cut both corners of the flattened end at an angle to form a pointed, reed-like shape.
3. Place the pointed end between your lips and blow gently until you hear a buzzing sound.
4. Cut a small section from the opposite end of the straw.
5. Blow again and listen carefully to the difference in sound.
6. Continue shortening the straw in small sections and compare the notes.

What Will You Observe?

The straw produces a buzzing musical note when air passes through it. As the straw becomes shorter, the sound usually becomes higher in pitch. Students can try different lengths to produce different notes.

Science Behind It

Sound is produced by vibrations. When air is blown through the flattened end, the straw edges vibrate and create sound waves. The air column inside the straw also vibrates. A shorter air column generally produces a higher-pitched sound, while a longer one produces a lower-pitched sound.

16. Explore Air Pressure with an Upside-Down Glass

A glass filled with water can be turned upside down without spilling its contents when a piece of stiff paper covers the opening. This experiment shows that air exerts pressure, even though we cannot see it.

Materials Required

• 1 drinking glass
• Water
• 1 stiff index card or thick piece of paper
• A tray or sink

Steps to Follow

1. Fill the glass completely with water.
2. Place the card over the mouth of the glass, making sure it covers the entire opening.
3. Hold the card firmly against the glass.
4. Carefully turn the glass upside down over a sink or tray.
5. Slowly remove your supporting hand from the card.
6. Watch whether the card stays in place and the water remains inside the glass.

What Will You Observe?

The card remains attached to the opening, and most of the water stays inside the inverted glass. It may seem as though the card is holding the water by itself, but air pressure plays an important role in keeping it there.

Science Behind It

Air around us exerts atmospheric pressure in all directions. When the card covers the glass opening, the air pressure acting upwards on the card can be greater than the downward force from the water and the pressure inside the glass. This helps keep the card in place. A good seal around the rim is important for the experiment to work.

17. Make a Shadow Change Size

A shadow can look short, long or somewhere in between depending on where the light comes from. Students can use a torch and a small object to see how changing the distance between the light source and the object affects the shadow.

Materials Required

• 1 torch or flashlight
• 1 small toy or solid object
• White wall or large sheet of paper
• Ruler or measuring tape
• Dark room or dimly lit space

Steps to Follow

1. Place the toy or object in front of a white wall or sheet of paper.
2. Switch on the torch and point it towards the object.
3. Move the torch close to the object and observe the shadow.
4. Slowly move the torch farther away while keeping the object in the same position.
5. Notice how the size of the shadow changes.
6. Try moving the object closer to the wall while keeping the torch in place.
7. Compare the different shadow sizes.

What Will You Observe?

When the torch is close to the object, the shadow usually appears larger. Moving the torch farther away makes the shadow smaller. Bringing the object closer to the wall can also reduce the size of its shadow.

Science Behind It

Light travels in straight lines. When an opaque object blocks the light, a shadow forms on the surface behind it. The size of the shadow depends on the positions of the light source, object and screen. A nearby light source spreads light rays over a wider area behind the object, creating a larger shadow.

18. Test How Different Surfaces Affect Friction

A toy car may travel farther on a smooth floor than on a rough mat. This experiment lets students compare how different surfaces affect the movement of the same object.

Materials Required

• 1 small toy car
• A smooth floor or wooden board
• A piece of cardboard
• A towel or rough cloth
• A carpet or textured mat
• Books or a small ramp
• Measuring tape

Steps to Follow

1. Make a small ramp by placing one end of a board on a stack of books.
2. Place the toy car at the same starting point each time.
3. Release the car without pushing it and measure how far it travels on the smooth surface.
4. Repeat the test with cardboard, a towel and a textured mat placed at the bottom of the ramp.
5. Record the distance travelled on each surface.
6. Repeat each test a few times and compare the results.

What Will You Observe?

The toy car will usually travel farther on smoother surfaces and stop sooner on rougher ones. The distance may vary depending on the material and the condition of each surface.

Science Behind It

Friction is a force that opposes movement when two surfaces come into contact. Rough surfaces generally create more resistance to the movement of an object than smooth surfaces. As the toy car moves, friction between its wheels and the surface slows it down. This is why the car may cover different distances on different materials.

19. Make a Mini Greenhouse in a Plastic Bag

A small plant can grow inside a clear plastic bag when it receives enough light, air and water. This activity helps students observe how moisture collects inside an enclosed space and how seeds begin to grow.

Materials Required

• 1 clear resealable plastic bag
• 2 or 3 bean seeds
• Paper towel or cotton
• Water
• Small spray bottle or spoon
• Tape

Steps to Follow

1. Dampen the paper towel or cotton with a little water. It should be moist, not dripping.
2. Place the damp material inside the clear plastic bag.
3. Put the bean seeds between the paper towel and the side of the bag so they can be seen.
4. Seal the bag, leaving enough room inside for air.
5. Tape it to a bright spot indoors where it receives indirect sunlight.
6. Check the bag each day and make sure the paper towel stays slightly moist.
7. Observe the seeds over the next several days as roots and shoots begin to appear.

What Will You Observe?

Small water droplets may appear on the inside of the bag. After a few days, the seeds may split open and develop tiny roots, followed by shoots. The clear bag makes it easier to watch the early stages of germination.

Science Behind It

Seeds need water, oxygen and a suitable temperature to germinate. Water enters the seed and activates the processes that help it grow. Moisture released by evaporation can collect on the inside of the bag as droplets and later return to the paper towel. This creates a small, humid environment similar to some conditions inside a greenhouse. Light is important for the seedling’s growth after it develops green leaves.

20. Compare How Fast Ice Melts on Different Materials

An ice cube placed on a metal plate may melt at a different rate from one placed on a wooden board or plastic tray. This experiment helps students compare how different materials transfer heat.

Materials Required

• 3 equal-sized ice cubes
• 1 metal plate or tray
• 1 wooden board
• 1 plastic plate or tray
• Stopwatch or timer

Steps to Follow

1. Place the metal plate, wooden board and plastic tray next to each other in the same room.
2. Put one ice cube on each surface at the same time.
3. Start the timer as soon as the ice cubes are placed.
4. Observe the cubes at regular intervals without moving them.
5. Record how long each cube takes to melt completely.
6. Compare the melting times and identify which material caused the ice to melt fastest.

What Will You Observe?

The ice cube on the metal plate will usually melt faster than the ones on wood or plastic. The exact time may change depending on the room temperature, the thickness of the materials and their initial temperatures.

Science Behind It

Ice melts when it absorbs heat from its surroundings. Metal conducts heat more effectively than wood or plastic, so it can transfer heat to the ice more quickly. Wood and plastic are comparatively poor conductors of heat, which is why ice may melt more slowly on these surfaces. This experiment demonstrates how the thermal conductivity of a material affects heat transfer.

Conclusion

These science experiments at home give students an opportunity to explore scientific ideas using materials commonly found at home. Each activity focuses on a different concept, from chemical reactions and electricity to air pressure, heat, friction and plant growth. Students can record what happens, compare their results and try changing one condition at a time to see how it affects the outcome. Keeping a small experiment notebook can also help them remember their observations and understand the science behind each result.