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If the atmospheric gases were extremely ...

If the atmospheric gases were extremely soluble in water such that the entire atmosphere of the earth is completely absorbed by the waterbodies, resulting in zero atmosphere pressure, then how will it affect the gravitational field of earth?

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If the atmospheric pressure of earth becomes zero, then the outer space will start exerting pressure on earth and as a result , the size of the earth shrinks till an equilibrium is reached. Thus, the diameter of earth decreases and hence, the gravitational field of earth will become greater or more stronger.
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