英语翻译
Now,however,the relation between partial pressure (as defined in eqn 1.13) and total
pressure (as given by eqn 1.15) is true for all gases and the identification of partial
pressure with the pressure that the gas would exert on its own is valid only for a perfect
gas.
重点翻译第二个and 后面半句 the identification of .
物理学方面的知识，即分压定律的适用范围