压缩空气基础常识(国外英文资料).doc

压缩空气基础知识(国外英文资料) Compressed air base knowledge (1) What is air? What is wet air? Answer: the atmosphere around the earth, we used to call it air. The air in nature is a mixture of gases, one of which is water vapor. The air that contains a certain amount of water vapor is called wet air, and the air without water vapor is called dry air. The air around us is wet. At a certain altitude, the composition and proportion of dry air are basically stable, and it has no special meaning for the thermal performance of the whole wet air. The amount of water vapor in wet air is small, but changes in content affect the physical properties of wet air. The amount of water vapor determines how dry and humid the air is. The working object of a cold dryer is wet air. What is saturated air? Answer: under certain temperature and pressure, the amount of water vapor in wet air (that is, the density of water vapour) is finite; The wet air is called saturated air when the amount of water vapor at a certain temperature reaches the maximum possible concentration. The moisture that is not as high as the maximum possible amount of water vapor is called unsaturated air. Under what conditions does unsaturated air become saturated air? What is dew? A: by reducing the temperature of unsaturated air, the saturated air can be made by reducing the temperature of the unsaturated air. When unsaturated air becomes a breath of saturated air, liquid water droplets form in wet air, a phenomenon known as dew. What is atmospheric pressure? What is absolute pressure? What is a table pressure? Answer: surrounded by a thick layer on the surface of the earths atmosphere caused by the pressure surface of the earths surface or object is called atmosphere, symbol for B, direct effects on the container or pressure on the surface of the object, known as the absolute pressure, absolute pressure values with absolute vacuum as a starting point, symbols for the PABS; With pressure gauge, vacuum gauge, pressure instrumen