Fun physics Experiments

Science is all around us it is not just to the classroom or laboratory. There are lots of fun experiments that need very little equipment other than a few house items.

Rainbow in a Glass

Thickness is anything but solid. The physical experiment concept is by making a rainbow in a glass.

Materials need:

  • 5 glasses
  • Sugar
  • Water
  • Different colored food coloring
  • Tablespoon
  • Epic patience and a steady hand


  1. Line up the glasses and put 3 tablespoons of water into the first four glasses.
  2. Add one tablespoon of sugar to glass one, two to glass two, three to glass three, four to glass four.
  3. Stir carefully to dissolve the sugar.
  4. Now add a different color food coloring to each glass. Pour 1/4 of glass four into glass five.
  5. This is the complicated bit. You must pour the next layer (glass three) so softly that it doesn’t mix with the first layer.
  6. You can put a teaspoon just above the first layer and pour the mixture gently over the back of the spoon to reduce splatter.
  7. The more slowly you do this the better the results.
  8. When you have filled the glass to about the same size as the last layer repeat with glass two and then with glass one.

What is happening?

The different amounts of sugar in water create different densities of water.  Ultimately due to particle dynamics the layers will mix. The greater the difference in density, the longer the effect lasts. Water and oil once you mix the layers they will not settle back.

Self Inflating Balloon

Combine Biology and Physics to blow up a balloon with the power of yeast

You will need:

  • A used washed bubbly drinks bottle cap not required)
  • Latex balloon (thinner the better)
  • Elastic band
  • Measuring Jug
  • Yeast
  • Sugar
  • Water

What to Do:

  1. Place 2 teaspoons of yeast, 1 teaspoon of sugar and one cup of water into the bottle.
  2. Put the balloon over the top of the bottle and safe with the elastic band. Keep an eye on it

What’s happening?

Yeast is actually a micro-organism. The yeast is ‘eating’ the sugar and respiring. A product of respiration is Carbon Dioxide which slowly fills up the balloon.

Soda Volcano

You will need

  • A large bottle of diet coke
  • A pack of mentors
  • Fast hands
  • An open space

What to Do:

Drop a couple of mentors into a cola bottle and stand well back.


  1. The surface of the candy may look smooth but in physical terms it is actually quite rough.
  2. Fizzy drinks are fizzy because they feel a steady chemical reaction that releases carbon dioxide.
  3. The rough surface of the candy provides extra sites for this reaction to take place over – they are known as nucleation sites

Sticky Rice

  • Materials needed
  • Jam Jar
  • Pencil


  1. Get a clean jam jar. Fill to the top with rice.
  2. Hold the jar tightly with one hand and push a pencil right to the bottom.
  3.  Pull the pencil up slowly but not all the way out. The push it back down again. If the rice level starts to drop, top up the rice.
  4. The rice will solid around your pencil and you will be able to lift the whole jar with the pencil.

What’s Happening

The resistance between the pencil and rice is so large that you cannot easily pull the pencil out.

Bend water with static electricity

Materials required

  • Balloon
  • Steady Charger


  1. Blow up a balloon and rub it against your head to build up a static charge.
  2. Do this for several minutes to really get a decent charge.
  3. Turn a tap on it should be on enough for a steady but slow stream of water to come out, not just drips.
  4. Bring the balloon close to the stream of water and see what happens.

Cloud in a Bottle

We will create a cloud inside of a plastic bottle.  There is a great deal of amazing science going on in this very simple experiment.  In fact, this experiment is so simple that anyone can do it at home with common materials.

Materials Required

  • 1 Plastic Bottle
  • Pump


  1. Begin by pumping air into a plastic bottle and then quickly releasing the pressure.
  2. This quickly cools off the air and causes the water vapour to reduce into water droplets.
  3. This forms a thick cloud in a bottle and once the pressure is releases it takes less than a second to form.

What’s happening?

This experiment shows how clouds form in the atmosphere.  In the atmosphere, vanishing lakes and rivers cause water vapour to rise into the air. The higher it goes, the cooler it gets and finally it condenses back into water droplets in the form of a cloud. Inside of our bottle the fast decompression of the air is the cooling equipment which forms the cloud.

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Comments 2

  1. Shalima Ali k wrote:

    I find it useful for my school exhibition….thank u……

    Posted 16 Nov 2015 at 3:17 pm
  2. chitlu gangaraju wrote:

    nice experiments

    Posted 07 Feb 2017 at 4:32 pm

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