hygrometer

hygrometer (h-grm-tr)

Any of several instruments that measure humidity. The most common type of hygrometer consists of two, side-by-side mercury or electronic thermometers, one of which has a dry bulb, and one of which has a bulb wrapped with a wet cotton or linen wick. As water evaporates from the wet bulb, it absorbs heat from the thermometer, driving down its temperature reading. The difference in temperature between the two thermometers is then used to calculate the relative humidity. This type of hygrometer is also called a psychrometer. Other hygrometers make use of the temperatures at which dew forms and disappears to calculate the relative humidity. Older hygrometers used the length of a strand of hair, which stretches when it absorbs moisture, to measure relative humidity.- measuring instrument for measuring the relative humidity of the hygrometer - measuring instrument for measuring the relative humidity of the atmosphere

hygrodeik - a wet and dry bulb hygrometer

hygroscope - hygrometer that shows variations in the relative humidity of the atmosphere

measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something

psychrometer - a hygrometer consisting of a dry-bulb thermometer and a atmosphere

hygrodeik - a wet and dry bulb hygrometer

hygroscope - hygrometer that shows variations in the relative humidity of the atmosphere

measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something

psychrometer - a hygrometer consisting of a dry-bulb thermometer and a wet-bulb thermometer; their difference indicates the dryness of the surrounding air