Question

convert room atmospheric pressure of 30.8 in Hg to atmospheres . [ use 2.54 cm/in.]

Answer 1

Given 2.54 cm/in means 2.54 cm per inch=> 25.4 mm per inch. (10mm=1cm)

and also given 30.8 in Hg means 30.8 inches of mercury.

Now we will convert inches of mercury (in Hg) to millimeters of mercury (mm Hg).

P mmHg = 25.4 mm/in x P inHg=25.4 mm/in x 30.8 in Hg=782.32 mm Hg.

Now we will convert millimeters of mercury (mm Hg) to standard atmosphere (atm).

1 mm Hg=0.0013157894 x atm, therefore 782.32 mm Hg=0.0013157894 x 782.32 atm=1.029365 atm.

Therefore 30.8 in Hg=782.32 mm Hg=1.029365 atm.