Atmospheric pressure is 105 N/m2 at sea level. This means that
1) a column of air 1 square meter in cross section extending up to the top of the atmosphere weighs 105 N,
2) the weight of one cubic meter of air at sea level is about 105 N,
3) the density of air is 105 N/m3,
and the force of the atmosphere against a surface of one square meter is
4) somewhat less than 105 N.
5) about 105 N.
6) considerably more than 105 N.
Answer: 1, 5
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