What is the thermal energy density, in joules per cubic meter, of a typical gian

Question

What is the thermal energy density, in joules per cubic meter, of a typical giant molecular cloud? How does this compare to the thermal energy density of Earth's atmosphere at sea level?

(b) Suppose two cold (T = 100 K) giant molecular clouds of 105 solar masses each collide with a relative velocity of v = 10 kms1 , with all the kinetic energy of the collision being converted to heat. What is the temperature of the merged cloud after the collision? (Assume that the clouds consist of 100% neutral hydrogen gas.)

Explanation / Answer

Answer:

The thermal energy density is the thermal energy stored per unit volume. And can be calculated as follows;

T.D= Energy/ volume

Where, T.E= thermal energy density and Energy in the form of kinetic energy

And the average kinetic energy can be calculated as follows:

K.E= 3/2K*T

Where, K.E= kinetic energy, K= boltzman constant and T= given temperature.

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