1. The problem statement, all variables and given/known data Interstellar space, far from any stars, is filled with a very low density of hydrogen atoms (H, not ). The number density is about and the temperature is about 3 K. What is the edge length L of an LxLxL cube of gas with 1.0 J of thermal energy? I found: P = 4.14x10-17Pa Vrms = 273m/s 2. Relevant equations Eth = 3NKbT = 3nRT = 3pV 3. The attempt at a solution Eth = 1J Eth = 3pV = 3(4.14x10-17)V --> V = 8.05x1015 Is this the correct answer or is my math wrong somewhere? Thank you for any input!