Question

when we will put water on heating and close with a lid after sometime we will open lid we will find water droplets in the lid. Why?

Answer 1

Answer:

The water droplets are found in the lid due to evaporation of water. During evaporation, water tries to get out, but the lid traps it.

Answer 2

Well, boiling water from a pot produce vapour at about 100°C, about since it depends from the pressure and the distance (temperature drop) above the water surface.

This vapour will make contact with the lid of the pot, the lid will be at a temperature well bellow the 100°C, because its upper surface is in contact with the surrounding air (let's say 30°C) but hotter than that, since heat is transferred from the pot to the lid through metal heat conduction and from the vapours reaching the lid; we may assume that the lid will reach a temperature of let's say 60°C.

Now, as vapours (100% humidity, 100°C) contact the lid at 60°C (dew temperature less than vapour temperature), will condense in drops.

If you had your boiling pot in an oven and, carefully open the lid (now at the same temperature as the oven) you will not find any water drops.

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Suhani
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