In outer space the density of matter is about one atom per \( \mathrm{cm}^{3} \), mainly hydroge...

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In outer space the density of matter is about one atom per \( \mathrm{cm}^{3} \), mainly hydrogen atoms, and the temperature is about \( 3.4 \mathrm{~K} \). Calculate the average speed of these hydrogen atoms, and the pressure (in atmospheres).
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