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Psychrometrics is a term derived from the Greek psuchron (ψυχρόν) which means “cold “and metron (μέτρον) meaning “means of measurement”. It is used to describe the field of engineering which is concerned with the determination of physical and thermodynamic properties of gas-vapor mixtures. The principles of psychrometry can be applied to any physical system that consists gas-vapor mixtures, the most common system of interest is the mixture of water vapor and air, because of its application in heating, ventilating and meteorology. In human terms, our thermal comfort is in large part a consequence of not just the temperature of the surrounding air, but the extent to which that air is saturated with water vapor. Many substances are hygroscopic which means that they attract water, usually in proportion to the relative humidity. Such substances include paper, cotton cellulose and other wood products, calcium oxide, fertilizers and many chemicals. Industries using these materials are primarily concerned with the relative humidity control in production and storage of such materials. Psychometric properties: The dry-bulb temperature is the temperature which is indicated by a thermometer exposed to the air in a place which is sheltered from direct solar radiation. The term dry-bulb is customarily added to temperature to distinguish it from dew point temperature and wet- bulb. In psychrometrics, the word temperature by itself usually means dry-bulb temperature. The name implies that the sensing bulb or element is in fact dry. Wet-bulb temperature: The thermodynamic wet-bulb temperature is a thermodynamic property of a mixture of water vapor and air. The wet-bulb value thermometer often provides an adequate approximation of the thermodynamic wet-bulb temperature. A psychrometer is a device that includes both a wet-bulb thermometer and dry bulb thermometer.
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