hygrometer
thumb|A hair tension dial hygrometer with a nonlinear scale.
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A hygrometer is an instrument that measures the amount of moisture in the air, or humidity. It matters because knowing humidity levels helps us understand weather conditions, monitor environments for comfort and health, and protect materials that can be damaged by excessive moisture.
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Article
21 sectionsContents
- Classical hygrometer
- Ancient hygrometers
- Metal-paper coil type
- Hair tension hygrometers
- Psychrometer (wet-and-dry-bulb thermometer)
- Sling psychrometer
- Chilled mirror dew point hygrometer
- Modern hygrometers
- Capacitive
- Resistive
- Thermal
- Gravimetric
- Optical
- Applications
- Difficulty of accurate humidity measurement
- Calibration standards
- Psychrometer calibration
- Saturated salt calibration
- See also
- References
- External links
thumb|A hair tension dial hygrometer with a nonlinear scale.
A hygrometer is an instrument that measures humidity, that is, how much water vapor is present in the air. Humidity measurement instruments usually rely on measurements of some other quantities, such as temperature, pressure, mass, and mechanical or electrical changes in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can be used to indicate the humidity. Modern electronic devices use the temperature of condensation (called the dew point), or they sense changes in electrical capacitance or resistance.