(a) a The graph shows the relation between atmospheric pressure and altitude. 30 25 20 Altitude (km) 15 10 5 0 1100 Air Pressure (millibars) (1) At which altitude is the pressure maximum? (ii) What can be inferred from the above graph? (iii) Define atmospheric pressure.
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At sea level, the atmospheric pressure is roughly one kilo per square centimeter. Your thumb is about a square centimeter, if you extend it, do you feel a pressure of one kilo? of course not because the air is a fluid and it presses in all directions, also from under.
Any non-living material on earth that cannot sustain that pressure is, simply, not here anymore.
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