Does the air contract, as it cools?- Science Mug experiment

 Take a little water in a flask and heat it. After sometime, when the water starts boiling, remove the flask away from the flame and fix a balloon on the mouth of the flask. Within a few moments, you will observe the balloon getting drawn to the flask, gradually.



Why does it happen so? Have you understood?

When the flask is heated, the air in the flask also becomes hot along with the water. So the air gets expanded and some part of its goes out of the flask. Similarly, when the water starts boiling, some part of it gets converted into steam which pushes some more air out of the flask.

Now, when a balloon is fixed on the mouth of the flask, it stops the passage of the air and the steam totally. So, when you stop heating the flask, the steam present in it will become cool and will again get converted into water. The air inside the flask too will contract, causing the pushed out air to return to fill the vacuum. But now, the balloon is there to check it. Thus, only one option is left with the outside air—to come back to the flask and to push the balloon also along with it inside the flask. This is what precisely happens.

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Does the air contract, as it cools?- Science Mug experiment Does the air contract, as it cools?- Science Mug experiment Reviewed by Wrestling Mirror on May 16, 2021 Rating: 5

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