1. The problem statement, all variables and given/known data I am writing my Extended Essay for IB, where I look at the possibility of obtaining accurate results in open system of a school, by accounting for all energy losses that occur during the investigation. Before conducting my experiments (which included an air track with two colliding vessels, followed up by 2 'frictionless' vessels on a track), I found the following equation for calculating the energy of sound: Where: p - sound pressure v - Particle velocity ρ0 - density c - sound speed In my case, the values are as follows: p - 6.324*10^-2 Pa v - 1.531*10^-4 ms^-1 ρ0 - 1.204 kgm^-3 c - 343.26 ms^-1 2. Relevant equations Is this formula valid? If so, how do I solve this integral? The integral does not remind me of anything I have seen so far. I also cannot find any other reference to this formula besides wikipedia (http://en.wikipedia.org/wiki/Sound_energy) 3. The attempt at a solution I did visit the maths and physics departments in my college. Neither was able to help me. Maths department stated this formula doesn't even look correct, while the physics department told me to ask somewhere else.