SAT物理题
问题描述：
SAT物理题
Which of the following statements is true about the ideal gas contained at a fixed volume when its temperature is raised?
A.The density of the gas decreases.
B.The average velocity of the gas particles increases
C.the density of the gas increases.
D.the pressure remains constant.
E.the pressure decreases.
为什么答案选的时D啊而不是B呢?
答
B