Humidity and temperature
The capacity of a gas (or a space) to hold water depends on its temperature. The higher the temperature, the more water vapour it can contain.
- normal room temperature - air typically holds about 1 % of water vapour
- hot - atmosphere has greater capacity to hold water vapour
- cold - atmosphere has less capacity to hold water vapour
When the air holds the maximum amount of water vapour at a particular temperature it is said to be saturated.
In air this can happen if:
- Capacity is reduced by a lowered temperature and amount of water vapour stays consistent
- More water vapour is added.
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