5 Little Questions: Dewpoint and Relative Humidity

Front

What is dewpoint?

Back

Dewpoint is the temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid water.

Front

How is relative humidity defined?

Back

Relative humidity is the ratio of the current amount of water vapor in the air to the maximum amount of water vapor the air can hold at that temperature, expressed as a percentage.

Front

What is the relationship between temperature and relative humidity?

Back

As temperature increases, the capacity of air to hold moisture increases, which can lead to lower relative humidity if the amount of moisture remains constant.

Front

What happens to dewpoint as relative humidity increases?

Back

As relative humidity increases, the dewpoint also increases, indicating that the air is holding more moisture.

Front

What is the formula to calculate relative humidity?

Back

Relative Humidity (%) = (Actual Vapor Pressure / Saturation Vapor Pressure) x 100.

Front

What is the significance of a wet-bulb temperature?

Back

The wet-bulb temperature indicates the amount of moisture in the air and is used to calculate relative humidity.

Front

If the dry-bulb temperature is equal to the wet-bulb temperature, what does that indicate?

Back

It indicates that the relative humidity is 100%, meaning the air is fully saturated with moisture.

Front

How can you determine the dewpoint from dry-bulb and wet-bulb temperatures?

Back

You can use a psychrometric chart or formulas that relate dry-bulb and wet-bulb temperatures to find the dewpoint.

Front

What is the dewpoint when the air temperature is 28°C and the relative humidity is 47%?

Back

16°C.

Front

What is the dewpoint when the dry-bulb temperature is 18°C and the wet-bulb temperature is 13°C?

Back

3°C.