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How water vapour is present in air at room temperature

Question asked by gdchethan in #Coffee Room on May 30, 2013
gdchethan
gdchethan 路 May 30, 2013
Rank D3 - MASTER
we say humidity that is water content in air ..... that is water in vapour stage in air .......my question is how water can be in vapour state at room temperature Posted in: #Coffee Room
rahul69
rahul69 路 May 30, 2013
Rank B2 - LEADER
gdchethan
we say humidity that is water content in air ..... that is water in vapour stage in air .......my question is how water can be in vapour state at room temperature
Some molecules ( which are at the surface of ,say a glass of water), may randomly take away energy of neighboring molecules due to collisions, and may escape as water vapor.馃槝, this is how I think it happens.
gdchethan
gdchethan 路 May 30, 2013
Rank D3 - MASTER
yeah water evaporates thats right but how can water remain at vapor state at room temperature
Whats In Name
Whats In Name 路 May 30, 2013
Rank B3 - LEADER
Evaporation is different from boiling.It occurs at any temperature until our environment reaches saturation.Water from Oceans,rivers (etc) and even clouds continuously evaporates and thus vapours in atmosphere.Concept of evaporation is already explained by rahul69
Ramani Aswath
Ramani Aswath 路 May 30, 2013
Rank A1 - PRO
A substance can be in one or more of three states - solid, liquid and vapour at any given temperature. There is one point called triple point at which all three states can be in equilibrium.
Temperature is a measure of the average kinetic energy of molecules. In any large collection of molecules there will be some molecules that have a high kinetic energy. When this is more than the cohesive force between molecules in the solid or liquid states such molecules can escape into the gas phase.

If ice is kept in a closed container at a temperature below 0 degC, some molecules escape and be a vapour without any liquid water being there!

If you check your fridge you will notice that vegetables dry up if left open long.

Incidentally that is how freeze drying is done.

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