Here's why it's not just the average speed:
* Gas molecules move randomly: They don't all travel at the same speed. Some move very fast, some very slow, and most fall somewhere in between.
* The RMS speed accounts for this randomness: It takes the square root of the average of the squared speeds of all the molecules. This gives a more accurate representation of the overall speed of the molecules in a gas.
The formula for calculating RMS speed is:
```
v_rms = √(3kT/m)
```
Where:
* v_rms is the root-mean-square speed
* k is the Boltzmann constant (1.38 x 10^-23 J/K)
* T is the absolute temperature in Kelvin
* m is the mass of a single molecule
Important Note: The RMS speed is a measure of the *average* speed of the molecules. Individual molecules will be moving at a range of speeds, but the RMS speed gives a good indication of the typical speed.
