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A hygrometer is an instrument used to measure the amount of humidity and water vapour in the atmosphere, in soil, or in confined spaces. Modern electronic devices use temperature of condensation (called the dew point), or changes in electrical capacitance or resistance to measure humidity differences.
Correspondingly, what is a humidity gauge called?
A humidity monitoring device is called a hygrometer. Hygrometers may be designed for indoor or outdoor humidity monitoring use (or both). Below is a summary of the types of hygrometers available for measuring humidity.
- Step 1: Fill the empty bottle cap about 3/4 full of salt.
- Step 2: Pour a very small amount of distilled water into the cap, to create a slurry.
- Step 3: Place the lid inside the zip-lock bag, then place the hygrometer inside the bag, display side up, near to the bottle cap.
One may also ask, how does a humidity gauge work?
In a resistive sensor, electricity flows through a piece of ceramic material exposed to the air. The higher the humidity, the more water vapor condenses inside the ceramic, changing its resistance. Measuring how much current flows through the ceramic gives an accurate measurement of the humidity.
The most common type of hygrometer, which is called a psychrometer, uses two thermometers: one with a wet bulb and one with a dry bulb. Temperatures drop as moisture evaporates from the wet bulb, and the relative humidity is determined by comparing the temperature differences between the two thermometers.