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Answer:
OK use dimentional analysis to find mmHg
28.5in x (2.54cm/1in) x (1m/100cm) x(1000mm /1m) =724mmHg
Considering 1atm=760mmHg then it would be 0.953atm
First convert inches of Hg to cm of Hg:
1 in. = 2.54 cm, so 28.5 in. = 28.5 * 2.54 =72.39 cm.
Now convert to mm Hg by multiplying by 10, so 72.39 cm Hg =
723.9 mm Hg.
Now, 1 atmosphere = 760 mm of Hg, so we convert from mm Hg to atm. by multiplying mm Hg by (1 atm. / 760 mm Hg). (With mm Hg in the denominator mm Hg will cancel out and we will be left with atm.) Thus,
723.9 mm Hg * (1 atm. / 760 mm Hg) = 723.9 * 1 / 760 =
0.9525 atmospheres.
29.9"Hg = 1 atm.
28.5/29.9 = 0.95atm.
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