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    Interstellar space: pressure, rms speed of the atoms

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    Interstellar space, far from any stars, is filled with a very low density of hydrogen atoms (H, not H_2). The number density is about 1 atom/cm^3 and the temperature is about 3K.

    A & B) Estimate the pressure in interstellar space. Give your answer in Pa and in atm.

    C) What is the rms speed of the atoms?

    D) What is the edge length L of an LxLxL cube of gas with 1.0 J of thermal energy? Give your answer in meters.

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    https://brainmass.com/physics/atoms-molecules/interstellar-space-pressure-rms-speed-atoms-29847

    Solution Preview

    A & B) Estimate the pressure in interstellar space. Give your answer in Pa and in atm.

    p= 1/3 m n v^2

    where m= mass of hydrogen atom= 1.66x10^-27 kg
    or in scientific notation= 1.66E-27 Kg

    n = 1 atom/cm^3= 1000000 atoms/m^3

    v= rms speed= 273.5311 ...

    Solution Summary

    Estimates pressure in Interstellar space and the rms speed of the atoms in Interstellar space.

    $2.19

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