'The normal B.P in man is 120/80 mm/Hg'' What does 80 in the valve represent?

The normal blood pressure in man is 120/80 mm of Hg. What does 120 in this valve represent?

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Refer the given figure. What does it represent?

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A_(2)B is an ideal gas , which decompase according f to the equation : A_(2) B to A_(2) + (1)/(2)B_(2) . At start , the initial pressure is 100 mm Hg and after 5 minutes , the pressure is 120 mm Hg. What is the average rate of decomposition of A_(2)B ? Assume T and V are constant .