1. The problem statement, all variables and given/known data Clouds of interstellar hydrogen gas have densities of up to 1.0 X 10^10 atoms/m^3 and temperatures of up to 1.0 X 10^4 K. What is the pressure in such a cloud? 2. Relevant equations Ideal-Gas Law: pV=nRT 3. The attempt at a solution I don't know how to find the volume or number of moles for the equation. Please help.