![]() ![]() Using this we can find the value of relative humidity. The temperature where these two axes will meet is the dew point temperature. Note at least 5 readings and plot a graph between dry bulb temperature and the difference between dry bulb and wet bulb temperature. ![]() Once noted the individual temperature, record the difference between the dry bulb and wet bulb. If the opposite is happening, the water being used is hot. Note that the wet bulb temperature is always lower than the dry bulb temperature. Before noting a psychrometer reading, ensure that you have swung it in the room for almost a minute, and then note down the dry bulb and wet bulb reading. The working of a psychrometer is based upon the assumption that evaporation is a cooling process. So we can put it this way, the smaller the change in wet bulb temperature, the more humid the air is. Wet air on the other hand does not absorb much moisture from the bulb, therefore there is no significant change in temperature. Dry air absorbs more moisture from the bulb, which in return cools it off more. In a psychrometer the amount of evaporative cooling on the wet bulb is directly proportional to the amount of moisture present in the air. A dry bulb thermometer, as you can observe from the image, is just a regular thermometer, whereas a wet thermometer has a wet cloth wrapper around the bulb which remains moist by the distilled water present in the water container. Design of PsychrometerĪ psychrometer consists of two bulbs, a wet bulb, and a dry bulb. ![]() It is also known as a wet and dry bulb thermometer. The difference between the readings of the thermometers gives an idea of the atmospheric humidity. It is a type of hygrometer that consists of two thermometers, one of which is a dry bulb and the other is a moist and ventilated bulb. This is a device used for measuring atmospheric humidity. In this Chemistry article, you will learn about the psychrometer, its design, working, reading, types, uses, and limitations. It is based on the principle that dry air enhances evaporation, as opposed to wet air, which hinders it. In the Greek language, the term psychrometer means “cold measure’’. It was invented by German inventor Ernst Ferdinand August, who patented the term “psychrometer” in 1818. It measures the wet bulb and dry bulb temperature, using which humidity can be determined. The device used for measuring the humidity in the atmosphere is known as a psychrometer. ![]()
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