从原理上说,空气密度的直接测量方法是用天平称出某一容器在充有空气和抽掉空气后的质量差,除以被抽出空气的体积,所得的商,即为空气的密度。 另一种方法则基于阿基米德定律,在一只绑住的塑料袋内,将发酵用的苏打粉跟食用醋混合起来,以产生二氧化碳气体。测定这塑料袋在充有二氧化碳气体后所受的浮力,且在已知这塑料袋的体积的情况下,就可计算出空气的密度。这种方法的 In principle, the direct measure of air density is to use a balance to weigh out the difference in the mass of a container after being filled with air and withdrawing air, divided by the volume of air being extracted. The resulting quotient is the density of air. The other method, based on Archimedes’s law, combines fermented soda flour with vinegar in a plastic bag that is tied to produce carbon dioxide gas. The buoyancy of the plastic bag after it was filled with carbon dioxide gas was measured, and the density of air was calculated when the volume of the plastic bag was known. This method of