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Dry Bulb Temperature is the temperature measured by a thermometer from ordinary air, which is commonly referred to as air temperature in weather forecasts.
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Wet Bulb Temperature is the temperature indicated by a thermometer when the mercury ball is wrapped in a wet cotton cover and meanwhile moisture is naturally evaporating in the environment.
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Relative Humidity is a ratio of actual moisture content in air to the moisture content of saturation at the current temperature conditions.
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It is calculated by the mass of water vapor per unit of air mass.
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Wet air is cooled down while total pressure and humidity are kept unchanged, and the temperature at which the wet air reaches saturation is called the dew point.
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It represents the value of total energy in air, including sensible heat and latent heat.
