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A hygrometer is an instrument which measures the humidity of air or some other gas: that is, how much of it is water vapor. [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.
With the inventions of the hygrometer and thermometer, the theories of combining the two began to emerge during the sixteenth and seventeenth centuries. In 1818, a German inventor, Ernst Ferdinand August (1795-1870), patented the term “psychrometer”, from the Greek language meaning “cold measure”.
He also invented the dew-point hygrometer known by his name, [3] and a register pyrometer; [4] and in 1830 he erected in the hall of the Royal Society a water-barometer, with which he carried out a large number of observations. [5]
The first devices used to measure weather phenomena were the rain gauge, the anemometer and the hygrometer. The 17th century saw the development of the barometer and the Galileo thermometer while the 18th century saw the development of the thermometer with the Fahrenheit and Celsius scales.
The original company, Michell Instruments Ltd, was formed in 1974 in Cambridge, England, by Andrew Michell.In co-operation with scientists at Cambridge University, Michell developed a novel aluminium oxide dew-point sensor based on the thin-film capacitance principle originally proposed by Dr A C Jason et al. at the Torry Research Institute, Aberdeen, UK in the 1950s.
Over the past century, technology to create a huge variety of malleable polymers (chains of large, repeating molecules) has evolved into the umbrella term plastics, which are often derived from ...
Hygrometer for measuring humidity; Anemometer for measuring wind speed; Pyranometer for measuring solar radiation; Rain gauge for measuring liquid precipitation over a set period of time. Wind sock for measuring general wind speed and wind direction; Wind vane, also called a weather vane or a weathercock: it shows which way the wind is blowing.
Because of its increased risk of bleeding, those who have a history of bleeding or who have gastrointestinal disorders should not take aspirin, Blaha adds. Aspirin "weakens the stomach's ...