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than the thermal pressure. In the interstellar medium, matter is primarily in molecular form and reaches number densities of 10¹² molecules per m³ (1 trillion molecules per m³). In hot, diffuse regions, gas is highly ionized, and the density may be as low as 100 ions per m³. Compare this with a number density of roughly 10²⁵ molecules per m³ for air at sea level, and 10¹⁶ molecules per m³ (10 quadrillion molecules per

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