Quote:
Originally Posted by RWin
How much does an average hole weigh?
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Air density, like air pressure, decreases with increasing altitude. It also changes with variation in temperature or humidity. 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).
Density of air - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Density_of_air
Lets say a tunnel is 1000 metres long, 40 metres wide and 10 metres high. That "hole" would weigh approx. 490 tons. (if it was at sea level and 15 C.)