RMS Speed of Gas Molecules Calculator
💨 Gas Laws & Fluids. Use the RMS speed of gas molecules formula to find rms speed, temperature, molar mass: pick the value you want, type the others, and the answer updates as you go.
RMS speed515.24 m/s
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| RMS speed | m/s |
| Temperature | K |
| Molar mass | g/mol |
Worked example
Find the rms speed when Temperature = 298 K, Molar mass = 28 g/mol.
Using vrms = √(3RT/M): RMS speed = 515.24 m/s.
Frequently asked questions
What is the formula for RMS speed of gas molecules?
vrms = √(3RT/M).
What do the letters stand for, and what units are used?
RMS speed in m/s, Temperature in K, Molar mass in g/mol.
How do you calculate rms speed?
Put the values into vrms = √(3RT/M). For example, with Temperature = 298 K, Molar mass = 28 g/mol, rms speed = 515.24 m/s.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (rms speed, temperature, molar mass) and fill in the others: it rearranges the formula for you.
