Because we grew up in a pressurized system, our bodies have developed so that al

Question

Because we grew up in a pressurized system, our bodies have developed so that all pressures interior to our body are relatively close to atmospheric pressure. With small pressure differentials, we have a difficult time gauging the magnitude of atmospheric pressure. Consider a person lying on his stomach, with sheets of paper stacked on his back. If each sheet of paper has a mass of 0.00360 kg and is the standard letter size 8.5" × 11" (0.216 m × 0.279 m), how many sheets would stack to produce a pressure on his back equal to atmospheric pressure (roughly 101325 Pa)?

Explanation / Answer

P = F/A

F= mg

A = 0.216 * 0.279

P = 0.00360 * 9.8 / (0.216 * 0.279 )

this is by one sheet

n = Total pressure / pressure by one sheet

n = 173079

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