In outer space the density of matter is about one atom per `cm^(3)`, mainly hydrogen atoms, and the temperature is about 3.6K. Calculate the average speed of these hydrogen atoms, and the pressure (in atmospheres).

Explanation

To solve the problem, we need to calculate the average speed of hydrogen atoms and the pressure in outer space where the density of matter is about one atom per cm³ and the temperature is 3.6 K.

### Step-by-Step Solution:

**Step 1: Calculate the average speed (Vrms) of hydrogen atoms.**

The formula for the root mean square speed (Vrms) of gas molecules is given by:

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