What do you mean by absolute humidity? What is its unit?
Answers
Easily stated humidity is simply the amount of water vapor held in the air. Water vapor is the gaseous state of water. As the temperature of the air increases more water vapor can be held since the movement of molecules at higher temperatures prevents condensation from occurring.
There are three main measurements of humidity: relative, absolute and and specific.
Absolute humidity (units are grams of water vapor per cubic meter volume of air) is a measure of the actual amount of water vapor in the air, regardless of the air's temperature. The higher the amount of water vapor, the higher the absolute humidity. For example, a maximum of about 30 grams of water vapor can exist in a cubic meter volume of air with a temperature in the middle 80s.
Relative humidity, expressed as a percent, is a measure of the amount of water vapor that air is holding compared the the amount it can hold at a specific temperature. Warm air can possess more water vapor (moisture) than cold air, so with the same amount of absolute/specific humidity, air will have a higher relative humidity. A relative humidity of 50% means the air holds on that day (specific temperature) holds 50% of water needed for the air to be saturated. Saturated air has a relative humidity of 100%.
The relative humidity of an air-water mixture is also defined as the ratio of the partial pressure of water vapor in the mixture to the saturated vapor pressure of water at a given temperature (See what is vapor pressure). Thus the relative humidity of air is a function of both water content and temperature.
Specific humidity refers to the weight of water vapor contained in a unit weight (amount) of air (expressed as grams of water vapor per kilogram of air). Absolute and specific humidity are quite similar in concept.
A device to measure relative humidity is called a hygrometer. The simplest hygrometer - a sling psychrometer - consists of two thermometers mounted together with a handle attached on a chain. One thermometer is ordinary. The other has a cloth wick over its bulb and is called a wet-bulb thermometer.
Answer:
The unit of absolute humidity is grams or kilograms per cubic meter.
Explanation:
As per the data given in the question we have to find absolute humidity and its unit.
It is expressed as the percentage of water vapor present in the air to the vapor holding capacity of the atmosphere at same temperature and same volume. It is the measure of water vapor in 1 cu.
It is the measure of water vapor in 1 cum air.
It is expressed as grams or kilograms per cubic meter.
Absolute humidity, which describes air’s water content, is used to measure the weight of water vapour per unit volume of air. The absolute humidity unit is given as g.m-3 which is units of grams of water vapour per cubic metre of air. Since other factors constantly affect absolute humidity, the results are less useful.
Hanes, the unit of absolute humidity is grams or kilograms per cubic meter.
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