What does a hygrometer measure
(Killeen, United States)
what does a hygrometer and anemometer do in the weather?
These things are special instruments for measuring weather:
For instance, a thermometer measures temperature and a barometer measures pressure.
Now for the two you asked about:
What does a hygrometer
measure? A hygrometer measures the amount of water vapor in the air,
the humidity. Some use a salted metalstrip to display humidity as a function of the differing expansion rates of the two substances. Some use hair because it responds well to moisture changes. Others use electronic circuitry in the form of refrigerated components collecting dew or measurements of changes in electrical capacity, resistance or conductivity. More on hygrometers at http://www.stuffintheair.com/hygrometermakes.htmlAnemometers,
like the one shown above, measure the wind speed, while a weather vane points out the wind direction for you. Most familiar ones measure wind speed, and others measure changes in pressure to deduce speed. more on wind measurements at http://www.stuffintheair.com/weathervanestore.htmlSearch
this site for more information now.