If humid air cools, then at some point the water vapour condenses and water drops are formed. One of the particular properties of air is, for example, that it can contain no more than a fixed amount of water vapour at a specific temperature. The Psychrometric chart describes the properties of air at different temperatures and moisture contents, in order for us to understand the physical backdrop to the transfer of moisture and energy in our environment. This is because of the energy content of the air. However, if we have to exercise strenuously, like running a marathon, then a moderate temperature and a not too high humidity is more favourable, because we are able to release our excess body heat through perspiration and cooling. Warm humid air is better for our airways and lungs than cold dry air. Voogt June 2013ΔΆ Every grower should know the Psychrometric chart by heart Introduction What is the Psychrometric chart? We all know that the temperature and moisture content of the air is important for our respiration. 1 The Psychrometric chart and greenhouse climate control Mr.
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