alleryA cubic metre of sea-level air has a mass of about how much?
A0.13 kg
B12.9 kg
C1.29 kg
D129 kg
Answer & Solution
Correct answer: C. 1.29 kg
1. Air is light but not negligible.
2. At sea level it is about 1.29 kg per cubic metre, or 1.29 g per litre.
3. Other options are out by factors of ten, and density falls with altitude.
_Source: Wikipedia, Atmosphere of Earth, Density and mass_
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