The ratio of the amount of moisture in the air at a specific temperature to the maximum amount (100%) of water that the air could hold at that specific temperature, expressed in a percentage. Absolute Humidity cannot be measured, only calculated, and is expressed in grams of water per kg of air. Dew point defines the point at which air will become saturated and. If a certain amount of air, let's say 1 kg, contains a certain amount of water, let's say 16.1 gr., then we can state that the Absolute Humidity is 16.1 gr of Water per Kg of Air. To put it into numbers, a relative humidity of 50 means the air is holding half of the water vapor it’s capable of holding. In very dry areas, the dew point is very far from, and much lower than, the actual air temperature, like, for instance, in the Thar Desert in India, or the Gobi desert in China. The term relative humidity (RH) refers to the actual level of moisture in the air compared with the moisture content of saturated air at the same temperature. This is why simply looking at the relative humidity percentages isnt a great way to get an idea of how it will actually feel outside. The hot day has a higher capacity for water in the air. In very humid areas, the dew point is very close to, but just below, the actual air temperature, for instance, in and near tropical rainforests, or near oceans. 100 humidity on a 55☏ day wont feel as 'muggy' as 50 humidity on a hot 95☏ day. If there is a lot of water vapor in the air, the humidity will be. Humidity is the amount of water vapor in the air. The closer the dew point is to the actual air temperature, the more humid the air is. When air has reached the dew-point temperature at a particular pressure, the water vapor in the air is in equilibrium with liquid water, meaning water vapor is condensing at the same rate at which liquid water is evaporating. Dew point will always be equal to or lower. If the actual air temperature drops to the dew point, the air will become saturated with water in the form of dew, fog or condensation. Dew point is the temperature at which point the air is completely saturated with water vapor and can hold no more. The dew point can never be higher than the actual air temperature. The dew-point temperature is the temperature that air must cool to in order to saturate.
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