3RTM\sqrt{\frac{3 R T}{M}}M3RT
2RTM\sqrt{\frac{2 \mathrm{RT}}{\mathrm{M}}}M2RT
8RTM\sqrt{\frac{8 \mathrm{RT}}{\mathrm{M}}}M8RT
RTM\sqrt{\frac{\mathrm{RT}}{\mathrm{M}}}MRT