Question: Interstellar space, far from any stars, is filled with a very low density of hydrogen atoms (H, not H 2 ). The number density is

Interstellar space, far from any stars, is filled with a very low density of hydrogen atoms (H, not H₂). The number density is about 1 atom/cm³ and the temperature is about 3 K.
a. Estimate the pressure in interstellar space. Give your answer in Pa and in atm.
b. What is the rms speed of the atoms?
c. What is the edge length L of an L × L × L cube of gas with 1.0 J of thermal energy?

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