RMS Molecular Speed Calculator — v = √(3kT/m)
Temperature is molecular motion: hotter gas means faster molecules. The Boltzmann constant k = 1.380649×10⁻²³ J/K is built in.
RMS Molecular Speed Calculator — v = √(3kT/m)
How to interpret the result
Nitrogen molecules in room-temperature air zip around at ~511 m/s — faster than a passenger jet — but collide billions of times per second, so they go nowhere fast.
Assumptions
- Ideal gas (point particles, elastic collisions)
- Temperature in kelvin
- m is the mass of one molecule