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The mixing ratio, being defined as the ratio of mass of water vapour per kilogram of dry air, can range from as..
  • A
    low as virtually 0 g/kg in cold, continental air masses to about 25 g/kg in tropical air masses.
  • B
    low as 10 g/kg in cold, continental air masses to about 15 g/kg in tropical air masses.
  • C
    high as 15 g/kg in cold, continental air masses to as low as 10 g/kg in tropical air masses.
  • D
    high as 25 g/kg in cold, continental air masses to as low as virtually 0 g/kg in tropical air masses.
As previously discussed, the capacity of air to hold water vapour is determined by its temperature. If temperature is lowered => the air is capable of holding less water (some water will condense).
The air at any given temperature can hold only a certain amount of water vapour before it becomes saturated and the mixing ratio is defined as the ratio of the mass of water vapour to the mass of dry air and is expressed in grams per gram or in grams per kilogram.
  • Cold air can hold less water vapour than warm air => mixing ratio will be low (sometimes as low as 0 g/kg).
  • Warm air, on the other hand, can hold more water vapour => mixing ratio will be high (sometimes reaching 25 g/kg).

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