There are two paths for establishment of the state equation of ideal gas, to one path, the Joule's law is independent, to the other, it is not. 摘要建立理想气体状态方程有两条途径，沿第一条途径焦耳定律是独立的，而沿第二条途径则焦耳定律不独立。
The application of Maxwell velocity distribution law rigidly proves that the statistical proof on the state equation of ideal gas. 摘要应用麦克斯韦速度分布律严格证明了理想气体状态方程。
