A hair tension dial hygrometer with a nonlinear scale.
Humidity and hygrometry
Specific concepts
Dew point
Dew point depression
Psychrometrics
General concepts
Air
Concentration
Density
Dew
Evaporation
Humidity buffering
(Atm.) Pressure
Liquid water
Avogadro's law
Nucleation
Thermodynamic equilibrium
Measures and instruments
Heat index
Sat. vap. density
Mixing ratio
Water activity
H. indicator
card
Hygrometer
Dry/Wet-bulb temperature
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A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much water vapor it contains.[1] 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 lead to a measurement of humidity. Modern electronic devices use the temperature of condensation (called the dew point), or they sense changes in electrical capacitance or resistance to measure humidity differences. A crude hygrometer was invented by Leonardo da Vinci in 1480. Major leaps came forward during the 1600s; Francesco Folli invented a more practical version of the device, while Robert Hooke improved a number of meteorological devices including the hygrometer. A more modern version was created by Swiss polymath Johann Heinrich Lambert in 1755. Later, in the year 1783, Swiss physicist and Geologist Horace Bénédict de Saussure invented the first hygrometer using human hair to measure humidity.
The maximum amount of water vapor that can be held in a given volume of air (saturation) varies greatly by temperature; cold air can hold less mass of water per unit volume than hot air. Temperature can change humidity.
^This is different from measuring the moisture content of something non-gaseous like soil, where liquid water is also involved.
A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much water vapor it contains. Humidity measurement instruments...
sea surface temperature Barometer for measuring atmospheric pressure Hygrometer for measuring humidity Anemometer for measuring wind speed Pyranometer...
The Friar of the weather (Frare del temps in catalan), is an absorption hygrometer created by Agapito Borràs Pedemonte in 1894. Borràs a native of Calella...
common, while cigar shops may have walk-in humidors. Many humidors use hygrometers to monitor their humidity levels. When used and maintained properly,...
accurate measurement include the gravimetric hygrometer, chilled mirror hygrometer, and electrolytic hygrometer. The gravimetric method, while the most accurate...
A thermometer in a sauna is typically used to measure temperature; a hygrometer can be used to measure levels of humidity or steam. Infrared therapy is...
in the mid-20th century were the rain gauge, the anemometer, and the hygrometer. The 17th century saw the development of the barometer and the Galileo...
various levels of the atmosphere and oceans. Aircraft use thermometers and hygrometers to determine if atmospheric icing conditions exist along their flight...
chloride is used as a relative humidity standard in the calibration of hygrometers. At 25 °C (77 °F) a saturated solution (45.8%) of the salt will yield...
instruments that may include thermometers (ordinary, maximum/minimum), a hygrometer, a psychrometer, a dewcell, a barometer, and a thermograph. Stevenson...
making a history of the weather. (Hooke specifies that a thermometer, a hygrometer, a wind gauge and a record sheet be used for proper weather records.)...
sea surface temperature Barometer for measuring atmospheric pressure Hygrometer for measuring humidity Anemometer for measuring wind speed Pyranometer...
resistive electrolytic, a capacitance or a dew point hygrometer. Resistive electrolytic hygrometers use a sensing element in the form of a liquid electrolyte...
the predecessor of the current Celsius scale. In 1783, the first hair hygrometer was demonstrated by Horace-Bénédict de Saussure. In 1802–1803, Luke Howard...
information on the cloud's altitude, length, and width. Balloon-carried hygrometers measure the humidity of the cirrus cloud but are not accurate enough...
umbrella) comes out to indicate rain. In fact, a weather house functions as a hygrometer embellished by folk art. The male and female figures ride on a balance...
additional sensors such as thermometer for measuring ambient temperature, hygrometer for humidity, and a sensor for ultraviolet ray measurement. A few smartphones...
Hygrometer to provide traceability for European humidity laboratories against the Two Pressure Humidity Generator and Primary Gravimetric Hygrometer operated...
at Dhahran, Saudi Arabia, at 3:00 p.m. on 8 July 2003. Devices called hygrometers are used to measure dew point over a wide range of temperatures. These...
in the Tropical Tropopause Layer characterised by SOWER chilled-mirror hygrometer network data in the Tropical Pacific". Atmospheric Chemistry and Physics...
the cedar lining the better. Many humidors contain an analog or digital hygrometer to aid in maintaining a desired humidity level. There are three types...
developed a bifilar-hygrometer which was widely used but did not prove in laymen's hands. After that Lambrecht built a hair hygrometer, "Model Klinkerfues"...
the air. The vapor content of air is measured with devices known as hygrometers. The measurements are usually expressed as specific humidity or percent...
Duke Ferdinado was obsessed with new technology, and had a variety of hygrometers, barometers, thermometers, and telescopes installed in the Palazzo Pitti...
Then the sugar reserve is measured with a must weight refractometer/hygrometer. If there's sugar left, then more yeast should be added to consume it...
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