How is sling hygrometer used to measure atmospheric conditions?

When air around the tube heats the liquid, the liquid expands and moves up the tube. A scale then shows what the actual temperature is. A BAROMETER measures air pressure. A SLING PSYCHROMETER measures relative humidity, using the cooling effect of evaporation.

What is the principle of sling psychrometer?

Once the wick is wet, hold the handle and whirl the psychrometer in the air. Whirling generates airflow around both the wet and dry bulbs. This action allows water in the saturated wick to evaporate, thereby reducing the temperature of the wet-bulb thermometer. The dry bulb temperature will remain unchanged.

How is relative humidity expressed?

It is expressed as grams of moisture per cubic meter of air (g/m3). Relative humidity also measures water vapor but RELATIVE to the temperature of the air. It is expressed as the amount of water vapor in the air as a percentage of the total amount that could be held at its current temperature.

How do psychrometers work?

A psychrometer measures humidity by taking both a wet-bulb and a dry-bulb temperature reading. With those two values known, the other properties of the air, including its moisture content, can be determined by computation or by reading a psychrometric chart.

How do you record relative humidity?

A device to measure relative humidity is called a hygrometer. The simplest hygrometer – a sling psychrometer – consists of two thermometers mounted together with a handle attached on a chain. One thermometer is ordinary. The other has a cloth wick over its bulb and is called a wet-bulb thermometer.

When air is heated relative humidity?

Answer Expert Verified. When air holds as much water vapor as it can for a given temperature (100\%relative humidity), it is said to be saturated. If saturated air is warmed, it can hold more water (relative humidity drops), which is why warm air is used to dry objects–it absorbs moisture.

What two factors affect relative humidity?

(1) Temperature is the foremost factor influencing RH, with the effect of specific humidity and direct contribution of air pollutant being second and third.

How do we measure relative humidity?

One way to measure relative humidity is to use a sling psychrometer, a device made of two thermometers, One thermometer measures the temperature of the dry air (dry-bulb thermometer) and the other measures the temperature of the air as evaporation occurs (wet-bulb thermometer).

How do people measure relative humidity?

The instrument used to measure relative humidity is the hygrometer. A variety of different digital and analog models exist, but you can build a simple version with your class. Known as the sling psychrometer, this hygrometer takes a measurement with a “wet bulb” thermometer and a “dry bulb” thermometer simultaneously.

How do you use a sling psychrometer?

A sling psychrometer consists of two thermometers mounted side by side. One is an ordinary thermometer, the other is covered with a wet piece of cloth. To make a humidity measurement you swing the psychrometer around for a minute or two and then read the temperatures from the two thermometers.

How do you find relative humidity with a sling psychrometer?

A sling psychrometer can be used to find relative humidity, which is expressed as a percentage. It is computed by multiplying the amount of moisture in the air at a given temperature, dividing by the maxi-mum amount of moisture the air could contain at that same temperature, and then multiplying the quotient by 100.

What is the function of the sling tool in a thermometer?

It is used to sling the device around in circular motions. The sling psychrometer works by allowing the water soaked up by the cloth wick/sock covering the wet-bulb thermometer to get evaporated into the air. To assist in this process, the handle/chain provided at the other end is used to whirl the device around.

What instrument is used to measure relative humidity?

For measuring the relative humidity in the air, an instrument known as a hygrometer is used. Of the several different types of hygrometers available for use, the sling psychrometer is the simplest, both in terms of design and ease-of-use.