Pressure in a closed system containing an ideal gas.

Mass density

$$ \rho $$ Unit $$ \frac{ \mathrm{kg} }{ \mathrm{m}^3} $$

Mass density is the mass of all gas particles per volume of the gas.

RMS velocity

$$ \langle v^2\rangle $$ Unit $$ $$

Root mean square (RMS) velocity is the mean value of the squared velocities \(v^2\) of gas particles. So you sum the squared velocities of individual particles and divide by the number of particles, then you get the RMS value. The unit of \( \langle v^2\rangle \) is \( \frac{\text m^2}{\text s^2} \).

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