The other day it was damp and overcast early in the morning, with a hint of rain in the air. With my steaming cup of coffee, I sat myself down in front of the computer, hoping to get some work done while the kids were still peacefully in bed. And in my quest for simple science experiments which could be easily carried out at home, I chanced upon this interesting experiment in which you could make a cloud in a bottle.
Image courtesy: wikiHow
Here’s how it works.
What You Need
- A large mason jar
- A rubber glove
- A torch
- Boiling water
- Pour a little bit of boiling water into the mason jar – just enough to cover the bottom – and swirl it around a bit gently.
- Seal the air into the jar by fitting the rubber glove wrist around the mouth of the glass jar such that the fingers point downwards towards the boiling water.
- After about 10 seconds, insert your fingers into the glove and move it upward so that the fingers are pulled out.
- Now light a match and drop it into the jar, covering its mouth again with the rubber glove. You will observe smoke forming in the jar and the water at the bottom will put out the lighted matchstick.
- Again, pull out the glove by inserting your fingers into it. You will observe a cloud forming inside the jar. If you re-insert the glove, the cloud will disappear.
- Shining a torch into the jar through the glass sides will enable you to observe the clouds better.
- In about 5 minutes, the cloud formed will gradually disappear with the particles settling down at the bottom.
The Science Behind it:
Inside the mason jar, the warm air is full of water vapor molecules from the boiling water. When the glove is inserted into the jar, it occupies some space; pulling it out frees that space and cools the air inside the jar to a certain extent. The water molecules present attach themselves to the smoke particles emanating from the lighted matchstick, eventually condensing into droplets which form the cloud. Every time the glove gets re-inserted into the jar, the air present within gets warmed up again and the cloud disappears.
After all, if there can be a storm in a teacup, there can also be a cloud in a bottle! :)