前言空气密度是一个重要的物理量。它的测量在物化研究、质量与密度计量以及气象学等研究中都有广泛而重要的应用。然而,过去空气密度几乎都是根据空气的成份和气压、温度、湿度测定进行计算的,这种方法可称为“温·湿·压”法,其精度受到较难测准的参量影响,而且计算麻烦。随着科学技术的发展,近年来一些国家用浮力法对空气密度进行直接测定。“浮力法”具有测定迅速、测定精度高和可对“温·湿·压”法进行校验等优点。本文将从以下四个方面进行介绍。 Introduction Air density is an important physical quantity. Its measurement has a wide range of important applications in the study of physico-chemical research, mass and density measurement and meteorology. However, in the past, air density was almost always calculated on the basis of air composition and air pressure, temperature and humidity measurement. This method can be referred to as a “warm and wet pressure” method whose accuracy is affected by parameters that are more difficult to measure, and Calculate trouble. With the development of science and technology, in recent years some countries use the buoyancy method to directly measure the air density. The “buoyancy method” has the advantages of rapid determination, high measurement accuracy, and verification of the “warm, wet and pressure” method. This article will be introduced from the following four aspects.