Convert a vacuum of 450 mm of mercury to an absolute pressure…

Convert a vacuum of 450 mm of mercury to an absolute pressure in pounds per square inch. (one decimal)
Water needs to be pumped from the basement of a production facility to the top floor of the building. The height difference is Y feet. What pressure (in psia) do you need to just overcome the hydrostatic head (i.e., the downward pressure of the water)? You can ignore all other factors in the calculations. (one decimal place)
HEIGHT DIFFERENCE: 47 feet

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