Hygrometer Wet And Dry Bulb Thermometer

The instrument is made up of two indentical thermometers one a wet bulb and the other a dry bulb.

Hygrometer wet and dry bulb thermometer.

A hygrometer is an instrument used to measure the amount of water vapor in air in soil or in confined spaces. The dry bulb temperature is basically the temperature of the air but the wet bulb temperature is affected by the evaporation of water from the fabric enclosing the bulb. Masons wet dry bulb hygrometer is used to calculate the water vapour content relative humidity of air at a given temperature. This type of hygrometer uses two basic mercury thermometers one with a wet bulb one with a dry bulb.

Hygrometer is an instrument used for measuring the amount of humidity in the atmosphere. Evaporation from the water on the wet bulb drops down the temperature which makes is display causing it to lower temperature as compared to dry bulb. For instance a wet and dry bulb requires the following numbers. 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.

Evaporation from the water on the wet bulb causes its temperature reading to drop causing it to show a lower temperature than the dry bulb. This ratio is also expressed as a percentage. An alternative definition for relative humidity is the ratio of the absolute humidity of the air to that of air saturated with water vapour at the same temperature and pressure. Masons hygrometer wet dry bulb c f simple form of psychrometer to provide easy way to measure the amount of water vapour in the atmosphere on a percentage scale known as relative humidity rh.

At 100 relative humidity the wet bulb temperature is equal to the air temperature dry bulb temperature. Wet and dry bulb psychrometers are the most simple and common way of measuring humidity. The concept behind a wet bulb thermometer is simple but keep in mind that to measure relative humidity it has to be used in conjunction with a dry bulb thermometer. The difference between the wet and dry bulb temperature enables the rh to be determined through the use of the table and calculate.

The temperature of the wet bulb. Wet and dry bulb hygrometer. At lower humidity the wet bulb temperature is lower than dry bulb temperature because of evaporative cooling. The wet bulb temperature wbt is the temperature read by a thermometer covered in water soaked cloth wet bulb thermometer over which air is passed.

Reading the hygrometer is not tricky but it may vary depending on the type and model you are using. It has two basic mercury thermometers comprising of a wet bulb dry bulb respectively.