A diver reaches a depth of 30.0 m the pressure in atmospheres that is exerted by this depth of water is 3atm.
76 cm × 13.6 = 10.3m = 10m = 1atm
30m = 3atm.
Fluids (i.e., liquids or gases) can exert pressure in addition to a solid surface. If you think about it, this could sound unusual because it's difficult to envision driving a nail with liquid. Imagine yourself immersed in water to a certain depth to help you understand this. Because of gravity, the water above you would be pressing downward on you. Going deeper would result in more water above you, which would also increase the weight and pressure of the water.
Gases' weight can also impose pressure in addition to that of liquids. For instance, the weight of the air in our atmosphere is significant and always at the bottom of it. The pressure exerted on your body by the weight of the atmosphere is surprisingly large.
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