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The water cycle is critical not only to weather, but to life on earth. Rain is necessary for the survival of plants and humans. Condensation is necessary for cloud formation. Evaporation is necessary to cooling and keeping a good balance of water vapor in the air.
This type of hygrometer uses two basic mercury thermometers, one with a wet bulb one with a dry bulb. 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. Humidity is important for our comfort and our health.