How did the hight became 8/12 can you please draw pressure of vacuum of less tha

Question

How did the hight became 8/12 can you please draw pressure of vacuum of less than ±0.1 psig. If for some reason that vent is closed (e.g., blocked by ice in a storm), then pumping liquid into the tank can bulge th tank outward, and pumping liquid out can collapse the tank inward, For fluids like gasoline this tank breathing can be a significant air pollution emission [I), which must be controlled Example 2.7. A layer of rain water 8 in deep collects on the roof of the oil- storage tank of Example 2.6. What net pressure force does it exert on the roof of the tank?

Explanation / Answer

The height is given in inches. To maintain the consistency in units, i.e, converting "inches" into "ft", the height is taken as 8/12.

Conversion is done by the following equation

1 ft = 12 inches

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