10 Easy Science Experiments Kids Can Do at Home — and the Science Behind Them

You don't need a lab to raise a young scientist. A kitchen, a few cups and ten curious minutes are enough. The secret is not the "wow" moment itself but what happens around it: asking your child to predict, observe carefully and explain. Here are ten safe experiments using everyday materials, each with a simple explanation you can share at your child's level.

1. Turn any experiment into real science

Follow the same four steps every time, and your child will be practising the scientific method without knowing it:

1. Ask: "What do you think will happen?"
2. Predict: your child says or draws their guess before starting. There is no wrong prediction.
3. Observe: watch closely. What changed? What sounds, colours or movements did you notice?
4. Explain: "Was your prediction right? Why do you think it happened?"

2. The 10 experiments

1. The fizzing volcano (ages 4+)

You need: a small bottle or cup, 2 tablespoons of baking soda, a little washing-up liquid, red food colouring, half a cup of vinegar, and a tray. Do: put the baking soda, a drop of soap and colouring in the cup on the tray, then pour in the vinegar. Why: vinegar (an acid) reacts with baking soda (a base) and produces a gas, carbon dioxide. The soap traps the gas in bubbles, so the foam rises and overflows like lava.

2. Walking water (ages 4+)

You need: three clear glasses, paper towels, red and blue food colouring. Do: put the glasses in a row; fill the two outside glasses with water and colour one red and one blue, leaving the middle glass empty. Fold two paper-towel strips and bridge each full glass to the empty one. Wait an hour. Why: water climbs through the tiny gaps in the paper (capillary action), "walks" into the middle glass, and the colours mix to make purple.

3. Dancing raisins (ages 4+)

You need: a clear glass of fizzy water and a few raisins. Do: drop in the raisins and watch for a few minutes. Why: raisins first sink, then gas bubbles stick to their wrinkly surface and lift them like tiny balloons. At the top the bubbles pop, and the raisins sink again, over and over.

4. Sink or float? (ages 4+)

You need: a bowl of water and ten small objects: a coin, a cork, an apple, a key, a LEGO brick, a leaf, a spoon, a crayon… Do: sort the objects into "will sink" and "will float" before testing each one. Why: whether something floats depends on how heavy it is for its size (its density) compared with water, not only on its weight. A big apple floats while a tiny coin sinks, which surprises most children.

5. Pepper that runs away (ages 5+)

You need: a plate of water, ground black pepper, a cotton bud and washing-up liquid. Do: sprinkle pepper on the water, dip a clean cotton bud in (nothing happens), then dip it in soap and touch the water again. Why: the surface of water behaves like a thin stretchy skin (surface tension). Soap weakens it where it touches, so the "skin" pulls away towards the edges and carries the pepper with it.

6. A bean in a jar (ages 5+, takes about a week)

You need: a clear jar, kitchen paper or cotton wool, two or three dried beans, water. Do: line the jar with damp paper, slide the beans between the paper and the glass, keep the paper moist and check every day. Why: with water and warmth, the seed starts to grow (germination). Your child will see the root go down and the shoot go up, whichever way the bean was placed. Turn the jar on its side after a few days and watch them change direction.

7. Make a rainbow (ages 6+)

You need: a glass of water, a sunny window and a sheet of white paper. Do: place the glass on the window sill in direct sunlight and move the paper on the floor until a small rainbow appears. Why: white sunlight is a mix of colours. When it passes through water, each colour bends by a slightly different amount (refraction), so the colours spread out, exactly as in a real rainbow after rain.

8. The magic balloon (ages 6+)

You need: a balloon, small pieces of tissue paper, a thin stream of water from a tap. Do: rub the balloon on your hair or a wool jumper for 20 seconds, then hold it near the paper, and then near the water. Why: rubbing moves tiny electric charges onto the balloon (static electricity). The charged balloon attracts the paper and even bends the stream of water without touching it.

9. The floating egg (ages 7+)

You need: two glasses of water, salt, two raw eggs. Do: stir 6 to 8 tablespoons of salt into one glass. Gently lower an egg into each glass. Why: salt makes water denser. In plain water the egg is denser than the water and sinks; in very salty water the water is denser than the egg, so it floats. This is also why it is easier to float in the sea than in a swimming pool.

10. A homemade lava lamp (ages 7+, with an adult)

You need: a clear bottle, water, cooking oil, food colouring and an effervescent tablet (such as a fizzy vitamin tablet). Do: fill a quarter of the bottle with water, add a few drops of colouring, then fill almost to the top with oil. Wait for the layers to separate, then drop in a piece of tablet. Why: oil and water do not mix, and oil floats because it is less dense. The tablet makes gas bubbles that carry coloured water up through the oil; at the top the gas escapes and the water drops fall again.

3. Quick reference table

4. Safety first

• An adult should always be present, especially with young children and with experiments 9 and 10.
• Never taste anything during an experiment, even kitchen ingredients.
• Keep vinegar, soap and salt water away from eyes; wash hands afterwards.
• Work on a tray or outdoors, and keep effervescent tablets out of children's reach.
• Wash raw eggs off hands and surfaces after experiment 9.

5. Questions that make children think

The best scientific learning happens through conversation. After each experiment, try one of these:

• "What would happen if we used twice as much?"
• "What could we change to make it faster, slower or bigger?"
• "Where have you seen this happen in real life?" (Bubbles in a fizzy drink, a rainbow after rain.)
• "How could we check that your explanation is right?"

More science on Kids Learning Hub

Test what your child has learned with our free Science Quiz, and find more ideas in our article on raising young scientists.

ScienKids

Explore the human body, plants, animals, space and more through interactive games and experiments — offline and free.

GET IT ONGoogle Play

Pick one experiment for this weekend, let your child make the prediction, and ask "why?" at the end. Curiosity grows every time a question is taken seriously.

Frequently asked questions