Coin jump up | Jumping coin trick revealed | Science experiment for kids

Описание: Coin jump up trick revealed | Science experiment

In this video, let's learn about the concept of thermal expansion by doing this simple experiment.

For this experiment you'll need



• Bowl of really really cold water
• Bottle
• Coin bigger than the bottle opening

PROCEDURE


• Keep the bottle neck and coin in the bowl of water which really as cold as ice.
• After some time take them out.
• Place the coin on the top of the bottle.
• Wrap your hands around the bottle and wait for several seconds.
• You will see the coin jumping on the mouth of the bottle .
• Remove your hands from the bottle.
• Observe now.
• Coin dances again on the mouth of the bottle.


Reason

At the beginning of the experiment the air and the bottle are cold because of the cold water. As soon as you place your hands around the body of the bottle, the air present in the bottle gets heated up. This causes the thermal expansion of the molecules of air. As the air molecules start to expand, these molecules want to come out of the bottle. Once there is more temperature in the bottle, there would more pressure. This is the ideal gas law.
Ideal gas law states that for homogeneous mixture of GASES, or a SINGLE GAS Pressure is directly related to the temperature.
Since the air molecules are heated up, they try to push the coin on the mouth of the bottle with the pressure created inside the bottle. This pressure makes the coin to jump on the mouth of the bottle.
Once you release the hands from the bottle, the air inside the cools down and hot air present outside wants to enter the bottle thereby making the coin to jump one last time and it stops when the air inside is eventually cool down.
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