Interpretation of the measurement introduction of the hygrometer

The principle of the hygrometer measuring complete relative humidity: Since the temperature-sensitive bubble of the wet bubble thermometer envelops the cotton thread, the lower end of the cotton thread is immersed in water ;

The wet bubble thermometer The temperature indication is always lower than the temperature indication (air temperature) of the dry bubble thermometer. This temperature difference is related to the rate of water evaporation (i.e. the relative humidity at that time).

According to the readings of the two thermometers, the relative humidity of the air can be found from the table or the curve.

It is used to measure the temperature and humidity of the environment to determine the environmental conditions of product production or storage. It is also used in people\'s daily life. The application is more extensive. The air is said to be humid whenthere is a lot of water vapor in the air.

History of the hygrometer

Possibly Leonardo - a man born in Italy in the 15th century - was an inventor of an instrument for measuring the amount of water vapor in the air.

He placed a piece of dry cotton on the side of a sky slam.

Then he placed an object of exactly the same weight as the cotton on the other side of the sky.

As the dry cotton absorbs water vapor from the air, it becomes heavier and the sky side begins to fall. The difference between the two weights is a measure of humidity.

Scientists use an instrument called a \"psychromometer\" to measure relative humidity. A \"psychromometer\" consists of two thermometers attached together.

A thermometer bulb is enclosed in a water-soaked material.

To begin measuring relative humidity, rotate the psychromometer until qthat the wrapped thermometer maintains a constant temperature, which must be lower than the dry thermometer.

The actual air temperature is measured by the thermometerying. The difference between the two temperatures is called the \"wet bulb depression\" and is the result of the evaporation of water from the substance.

Scientists record temperature and \"wet bulb depression\" on a dry thermometer, then plot a graph to calculate relative humidity. This is also the principle of operation of the wet and dry bulb hygrometer.

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