This paper deals with the statistical properties about two dimensional photongas and free electron gas.
讨论了二维光子气体和自由电子气体的统计性质。
2
The concept of the radiation pressure and the physical essence of it are presented based on the photongas.
从粒子的观点介绍了辐射压的概念，阐明了辐射压的物理实质，给出了计算辐射压的一般公。
3
Because here what we have is some atom that we're studying, in the case, it's going to be a gas, and we hit it with a photon that has some incident energy.