英语翻译包围地球的大气层是由气体构成的.起主要成分是氧气和氮气.大气层覆盖在地表上空厚达数英里.大气层的重量作用在地球上就产生了我们生活中的大气压.在一固定位置,除了天气变

Question

英语翻译
包围地球的大气层是由气体构成的.起主要成分是氧气和氮气.大气层覆盖在地表上空厚达数英里.大气层的重量作用在地球上就产生了我们生活中的大气压.在一固定位置,除了天气变化引起的微笑变化,大气压是相对不变的常数,为了标准化和作为比较时一个基本参考值,在海平面处的大气压被普遍接受为标准大气压.绝对压力通常被记作磅每平方英寸绝对压力（简记为psia）,定义为高于完全真空的压力.因此,对于围绕我们的空气而言,绝对压力和大气压是一回事.

Answer 1

The atmosphere surrounding the Earth is composed of gases,primarily oxygen and nitrogen,extending many miles above the surface of the Earth.The weight of that atmosphere pressing down on the Earth creates the atmospheric pressure in which we live.At a given point,the atmospheric pressure is relatively constant except for minor changes due to changing weather conditions.For purposes of standardization and as a basic reference for comparison,the atmospheric pressure at sea level has been universally accepted.Absolute pressure,normally expressed in terms of pounds per square inch absolute (psia),is defined as the pressure existing above a perfect vacuum.Therefore in the air around us,absolute pressure and atmospheric pressure are the same.