RMS Speed Calculator
Free calculate root mean square speed of gas molecules. determine v_rms = √(3rt/m) for ideal gases. Get instant, accurate results with our easy-to-use calculator.
Input Parameters
g/mol
Results
Select gas and temperature to calculate RMS speed
RMS Speed Formula
Formula
v_rms = √(3RT / M)
Where:
- • v_rms = RMS speed (m/s)
- • R = gas constant = 8.314 J/(mol·K)
- • T = temperature (K)
- • M = molar mass (kg/mol)
Typical Values (298K)
- • Hydrogen: ~1920 m/s
- • Helium: ~1360 m/s
- • Nitrogen: ~515 m/s
- • Oxygen: ~482 m/s