Answer :
Final answer:
Humidity can be expressed in grains per pound or grams of moisture per pound of dry air. Percent relative humidity is calculated as the vapor density over saturation vapor density, multiplied by 100. This helps to determine the dew point temperature at full saturation.
Explanation:
Humidity is expressed in grains per pound or grams of moisture per pound of dry air. Humidity measurements can be given in different units, but when it comes to expressing it in terms of weight of water vapor relative to the weight of dry air, the units are either grains per pound or grams per pound. The term percent relative humidity is different; it is defined as the ratio of vapor density (the amount of moisture in the air) to saturation vapor density (the maximum amount of moisture the air can hold at a given temperature), times 100 to express it as a percentage.
For example, if the vapor density is 9.40 g/m³ and the saturation vapor density is 23.0 g/m³, the percent relative humidity is calculated by taking the vapor density divided by the saturation vapor density and multiplying by 100. This calculation can help to determine the dew point, which is the temperature at which relative humidity would reach 100% for a specific concentration of water vapor in the air, indicating that the air is fully saturated.
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