Hygrometer
Hygrometer
Hygrometer (/haɪˈɡrɒmɪtər/; from Ancient Greek: ὑγρός, hygrós, 'wet' and μέτρον, métron, 'measure') is an instrument used to measure the amount of humidity and water vapor in the atmosphere, in soil, or in confined spaces.
Etymology
The term "hygrometer" comes from the Ancient Greek words hygrós meaning 'wet' and métron meaning 'measure'. It was first used in the 17th century to describe devices used for measuring the humidity level in the air.
Types of Hygrometers
There are several types of hygrometers, each with its own specific use and level of accuracy. Some of the most common types include:
- Psychrometer - This type of hygrometer uses the principle of evaporative cooling to measure humidity. It consists of two thermometers, one of which has a wet bulb and the other a dry bulb. The difference in readings between the two thermometers gives the humidity level.
- Dew Point Hygrometer - This hygrometer measures the dew point, or the temperature at which air becomes saturated with water vapor.
- Hair Tension Hygrometer - This type of hygrometer uses a human or animal hair under tension. The hair changes length as the humidity changes, and this change in length is used to measure the humidity.
- Chilled Mirror Dew Point Hygrometer - This hygrometer uses the principle of condensation on a mirror. The temperature of the mirror is controlled to just cause condensation, and this temperature is the dew point of the air.
Related Terms
External links
- Medical encyclopedia article on Hygrometer
- Wikipedia's article - Hygrometer
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