Typical Values MET
As tropical air is warm, it can hold a significant amount of water vapour. Frigid polar air, by contrast, can hold little if any. Typical values are 25 g/kg and 0 g/kg respectively. The examiner may try to trip you up by using different units - remember it is a ratio so the units have to be similar (g and kg) and that the actual units of the mixing ratio are grams per kg.