Convert an absolute pressure of 7 x 105 N/M2 to gauge pressure in lb/in2 (This value was stated to be just less than 90.0 lb/in2 in Example 13.9. Is it?)
Pressure in terms of lb/in2 is 86.95 lb/in2.
We use conversion units to convert N to lb and meters to inches.
Absolute pressure = 7 x 105 N/M2
gauge pressure = 5.99 x 105 N/m2
1 N = 0.225 lb
1 meter = 39.37 inches
Therefore, the pressure in new units is 86.95 lb/in2 which was stated as just less than 90 lb/in2.
Question: (a) The density of water at 0ºC is very nearly (it is actually ), whereas the density of ice at 0ºC is . Calculate the pressure necessary to keep ice from expanding when it freezes, neglecting the effect such a large pressure would have on the freezing temperature. (This problem gives you only an indication of how large the forces associated with freezing water might be.) (b) What are the implications of this result for biological cells that are frozen?
Question: A deep-sea diver should breathe a gas mixture that has the same oxygen partial pressure as at sea level, where dry air contains 20.9% oxygen and has a total pressure of 1.01×105 N/m2. (a) What is the partial pressure of oxygen at sea level? (b) If the diver breathes a gas mixture at a pressure of 2.00×106 N/m2, what percent oxygen should it be to have the same oxygen partial pressure as at sea level?
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