At the same temperature, the molecular speeds of two gases are $u_1$ and $u_2$, and their masses are $m_1$ and $m_2$, respectively. Which of the following expressions is correct?

Liquids diffuse more slowly than gases because.....

Explain the assumptions (postulates) of the kinetic molecular theory of gases.

$A$ helium molecule is two times heavier than a hydrogen molecule at $298 \ K$. According to the kinetic theory, the average kinetic energy of helium at $298 \ K$ is

The mass of molecule $A$ is half the mass of molecule $B$. The $rms$ speed of $A$ is twice the $rms$ speed of $B$. If the number of molecules in samples of $A$ and $B$ are equal,what is the ratio of the pressures of samples $A$ and $B$ in separate containers of equal volume?

The kinetic energy of one mole of any gas depends upon