Does a psychrometer measure humidity

Answer 1

Yes a psychrometer measure humidity as according to the definition ;

Psychrometer : An instrument that measure temperature and relative humidity.

Any instrument capable of measuring the psychrometric state of air is called a

psychrometer.In order to measure the psychrometric state of

air, it is required to measure three independent parameters. Generally two of these

are the barometric pressure and air dry-bulb temperature as they can be measured

easily and with good accuracy.

Two types of psychrometers are commonly used. Each comprises of two

thermometers with the bulb of one covered by a moist wick. The two sensing bulbs

are separated and shaded from each other so that the radiation heat transfer

between them becomes negligible. Radiation shields may have to be used over the

bulbs if the surrounding temperatures are considerably different from the air

temperature.

The sling psychrometer is widely used for measurements involving room air

or other applications where the air velocity inside the room is small. The sling

psychrometer consists of two thermometers mounted side by side and fitted in a

frame with a handle for whirling the device through air. The required air circulation (≈

3 to 5 m/s) over the sensing bulbs is obtained by whirling the psychrometer (≈ 300

RPM). Readings are taken when both the thermometers show steady-state readings.

In the aspirated psychrometer, the thermometers remain stationary, and a

small fan, blower or syringe moves the air across the thermometer bulbs.