The total mass of this planet's atmosphere may be higher than the Earth's but the gases present must be very lighter ones like hydrogen and helium. The escape velocity of the planet will be very high. Due to the high escape velocity, the light gases were not able to escape and hence forming a thick atmosphere   Would the atmosphere for this planet be thicker or thinner than that of the Earth?

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.