How does the density of matter in outer space compare with that in Earth’s atmosphere?

To give a quantitative idea of just how dilute the matter in outer space is, consider that roughly 2.5 × 1019 particles, typically atoms, occupy 1 cm3 (1 mL) of volume in the Earth’s atmosphere. In outer space there is, on average, only one single particle in this same volume. Outer space is a much better vacuum than even the best vacuums ever created on Earth!


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