You need to memorize standard pressure in each unit.
http://www.jiskha.com/display.cgi?id=1272497506
If you know those, three of the above are above standard pressure, one is below.
Which of these pressures is the lowest? 1.1 atm, 16.7 psi, 740 mm Hg, 111 458 Pa
4 answers
740 mm Hg
740 mm Hg
Which of these pressures is the lowest? 1.1atm, 16.7psi, 740mm Hg, 111458 pa