An absolute pressure gauge is submerged 50 m (1979 inches) below the surface of the ocean and reads P = 6.064 bar. This is P = 2434(inches of H2O), according to the unit conversions built into a particular calculator. Explain the apparent discrepancy between the pressure measurement and the actual depth of submersion.
What will be an ideal response?
The total pressure is equal to atmospheric pressure plus the weight per area 
of the mercury column. The
only trick is to do this in the non-SI units given. Let us compute the pressure in psia (pounds-force per square inch, absolute). To do so, we should convert the density of mercury from 
Thus, 
We also need to convert atmospheric pressure from in Hg to psia by multiplying by 0.4912 psi/(in Hg).
So, 
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