Barometric pressure changes are used by meteorologist to forecast short term cha

Question

Barometric pressure changes are used by meteorologist to forecast short term changes in the weather and are reported in units of inches of mercury. If th local barometric pressure is 28.62 inches of mercury (1 inch = 2.54 cm), calculate the pressure in atm, bar, and Pa. Barometric pressure changes are used by meteorologist to forecast short term changes in the weather and are reported in units of inches of mercury. If th local barometric pressure is 28.62 inches of mercury (1 inch = 2.54 cm), calculate the pressure in atm, bar, and Pa.

Explanation / Answer

P = 28.62 in

calculate pressure in :

a)

in atm

28.62 in = 28.62*2.54 = 72.6948 cm

1 cm = 10 mm ... so 72.6948 cm = 726.948 mm Hg

and

1 atm = 760 mm Hg

so

726.948 mm Hg --> 726.948 /760 = 0.95651 atm

b)

bar

1.013 bar = 1 atm

0.95651 atm --> 1.013 *0.95651 = 0.9691837575 bar

c)

1 atm = 101325 Pa

0.95651 atm --> 0.95651 *101325 = 96918.37 Pa

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