How much does a cubic meter (or yard) of atmosphere weigh?
The atmosphere weight is in millibars. WX predictions looks at millibar slices. For example I always pay attention to the 500 millibar maps. Higher from the ground the atmosphere is thinner and weighs less.
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That depends on what planet you're on.
At sea level and at 15 °C air has a density of approximately 1.225 kg/m3 (0.001225 g/cm3, 0.0023769 slug/ft3, 0.0765 lbm/ft3) according to ISA (International Standard Atmosphere).
A column of atmosphere starting at sea level and extending up until there is no more atmosphere weighs 14.7 lbs.
At sea level, at a temperature of 15°C, a cubic meter of atmosphere weighs 1.225 kilogram, or 2.70 pounds.
A cubic yard of atmosphere under the same conditions weighs 0.937 kilograms, or 2.06 pounds.
Just over 2 1/2 pounds at sea level, 70-degrees F or so.