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I always thought, being a railroad buff and familiar with PSI, that it was in Pounds per square inch. Some Path cars ran a standing pressure in the brake system- Main over equalizing, of ll0/70, exactly l0 pounds below the Human norms, the joke was the M-58 cars are a little anemic ( this was compressed air, to operate the brakes) Alas it is ( Blood pressure) actually in MM/Mercury ( Mercury column gauges are still in use, in some quarters) and NOT PSI. People still say (pounds) as it is a sort of flag of convenience, like the confusion of (Two Blocked) with Half Mast in reference to flag usage. Two Blocked originally meant the Flag was ALL the way up- touching the blocks of the pulleys. By some popular misunderstanding- as with the Blood Pressure, as Half is l/2 l over Two- somehow people will say ( the Flag was Two-Blocked for President Kennedy) for example, when they mean Half-Mast. so it goes.

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11y ago

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