Question

A huge explain about hygrometer

Answer 1

Answer:A hygrometer is an instrument used to measure the amount of water vapor in air, in soil, or in confined spaces. Humidity measurement instruments usually rely on measurements of some other quantities such as temperature, pressure, mass, a mechanical or electrical change 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 temperature of condensation (called the dew point), or changes in electrical capacitance or resistance to measure humidity differences. The first crude hygrometer was invented by the Italian Renaissance polymath Leonardo da Vinci in 1480 and 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. Most instruments respond to (or are calibrated to read) relative humidity (RH), which is the amount of water relative to the maximum at a particular temperature expressed as percent.

Answer 2

A hygrometer is a tool used to measure the moisture content of the air. It can be used either indoors or outdoors, but devices are usually specifically for one or the other. The hygrometer is very specialized and only gathers data about moisture content. If someone wanted to report a full humidity reading, such as relative humidity or dew point (two measurements used commonly in weather reports), they would more than likely also have to collect other data, like temperature or atmospheric pressure.

Types of Hygrometers

Several types of hygrometers have existed throughout history. The earliest and most basic were the metal-paper coil type. These hygrometers used physical moving parts to measure moisture content and were, therefore, quite inaccurate. Other types of hygrometers have used human or animal hair, wet and dry thermometers, and even mirrored surfaces to measure the dew point. All of these varieties are mostly out of date and no longer used, except in the cheapest applications.

Modern hygrometers use electronic sensors. These sensors allow for a much more accurate device that is easier to maintain. Unlike some of the early types of hygrometers, modern varieties can be placed anywhere because they tend to be much smaller.