The actual mixing ratio is defined as the mass of the water vapour to the mass of dry air.It's similar to the specific humidity, although this quantity is related to the total dry air plus aqueous vapour.
Meteorology, to compute the relative humidity and to trace the properties of air masses. Taking it further, this can be used in weather predictions and help you sleep better by ensuring that your well-deserved vacation is unlikely to be disturbed by unfavorable atmospheric conditions.
Engineering, for example, in calculations related to air conditioning and transporting the water vapour to control room humidity. You may appreciate it, especially during winter when heaters cause the air to become dry and unpleasant..
Learn more about humidity here:
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