Final answer:
To calculate relative humidity, you need to know the air temperature and the dew point temperature. The formula to calculate relative humidity is: Relative humidity = (actual vapor pressure / saturation vapor pressure) x 100%. Remember that relative humidity is a percentage, so the result will be between 0% and 100%.
Step-by-step explanation:
Calculating Relative Humidity
Relative humidity is a measure of how much moisture the air is holding compared to the maximum amount it can hold at a specific temperature. To calculate relative humidity, you need to know the air temperature and the dew point temperature.
The formula to calculate relative humidity is:
Relative humidity = (actual vapor pressure / saturation vapor pressure) x 100%
Actual vapor pressure is the pressure exerted by water vapor in the air and saturation vapor pressure is the maximum pressure the air can hold at a specific temperature. To find the saturation vapor pressure, you can use the Antoine equation or look it up in a table.
For example, if the air temperature is 25 °C and the dew point is 15 °C, you would calculate the relative humidity as follows:
1. Calculate the actual vapor pressure using the dew point temperature:
Actual vapor pressure = saturation vapor pressure at 15 °C
2. Calculate the saturation vapor pressure at the air temperature:
Saturation vapor pressure = saturation vapor pressure at 25 °C
3. Divide the actual vapor pressure by the saturation vapor pressure and multiply by 100%:
Relative humidity = (actual vapor pressure / saturation vapor pressure) x 100%
In this example, you would substitute the values for the actual and saturation vapor pressures in the equation to find the relative humidity.
Remember that relative humidity is a percentage, so the result will be between 0% and 100%.
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