Mass Location MET
Half the mass of the atmosphere is below 18000' (the 500hPa level, which is about half of 1013) and hence the pressure falls to half of MSLMSL —Mean Sea Level pressure at 18000'.
This is a question on both the Met and HPL syllabi. For Met, ensure you read the question - it could be about the mass, or the water vapour.
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What height would you find half the mass of the atmosphere beneath?