Question

A deep container filled with water up to its brim on a gas stove the container is covered with a lid when water starts boiling the lid shows up and down motion over the container.why id it so? Does it relate to the expansion or contraction of water on heating

Answer 1

Answer:

Here is your answer..

Explanation:

Hi buddy,

The tiny water droplets u see are known as Water Vapours

The water turns to gas due to extreme heating i.e. it satrts boiling but the lid doesnt allows the gas to move on. So the water in the form of gas gets condensed in the inner surface of lid.

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Answer 2

Yes, the above statement is relate to the expansion or contraction of water on heating.

Explanation:

• Water is boiling at above about 70C, rate of evaporation starts to get significant.
• When evaporation starts molecules of water are moving fast enough that some of them are able to jump out of the water into the air and form water vapour.
• So the air above the pan starts to fill up with steam.
• But not only is the steam jumping out of the water, some of it is recondensing back into the water.
• So, evaporating than condensing will occur.

To Learn More...

1.Expansion and contractions of water?

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