1. The problem statement, all variables and given/known data An ideal gas is kept in a container of constant volume. The pressure of the gas is also kept constant. If the initial rms speed is 1800 m/s, what is the final rms speed? 2. Relevant equations v(rms)=square root of [v(avg)]^2=square root of (3kT)/m 3. The attempt at a solution This was the only equation that I could find that dealt with rms speed, but the only problem is that I'm not sure how I can use just the initial rms speed to solve for the final rms speed with this equation.