Hi and welcome to the 5th episode of Mouniirah's Experiments! Today I would like to put into practice the concept of thermal expansion by making a coin dance with only cold water, a bottle and your hands. Thanks for joining me. Let's get started!
What you'll need:
A bowl of cold water
A bottle
A coin slightly bigger than the bottle opening
Instructions:
Keep the bottleneck and coin in the bowl of water, which is 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 start jumping.
How it works:
At the beginning of the experiment, both the air and the bottle are cold because of the cold water. As soon as you placed your hands around the body of the bottle, the air started to heat up, causing thermal expansion to take place. As the air molecules expand, it pushes its way out of the bottle, thus causing the cover, in this case the coin, to vibrate or jump up and down. This is what makes your coin magically jump! The coin will only stop jumping when the air inside the bottle eventually cools down. The behaviour of the coin can be explained by the concept of thermal expansion.
Thermal expansion happens when heat is applied to matter. When subjected to heat, the matter changes in volume as its particles begin to move around. This is when we notice that matter expands.
See:
Sources:
Normally, even after you removed your hands, the coin is supposed to still vibrated and jumped up and down on the opening of the bottle. But it doesn't work for me lol. You can try it and tell me in the comments whether you succeed or not. Thanks for watching. May God bless you, take care.
Comments