SOME COMMON UNITS of PRESSURE
 1 Pa Pascal = 1 N/m2 (The SI unit) 1 psi = 1 lb/in2 (English unit) = 6,891 Pa 1 Bar = 105 N/m2 = 100 kPa ≈ 1 atm 1 Tor = 1 mm Hg = 133.3 Pa ≈ 1 kPa 1 atm = 101.3 kPa = 760 mm Hg = 29.92 in Hg = 14.70 psi

TYPICAL VALUES OF PRESSURE
 Pressures Values (Pa = N/m2) Best laboratory vacuum ≈ 10-12 Pa Sunlight at the Earth's surface ≈ 3 mPa Rock Concert (Pressure on the ear drum)* ≈ 10 Pa Lincoln Penny lying flat (balanced on edge)* 85 Pa (≈ 16 kPa) Blood pressure* 1 kPa - 15 kPa Recyclable Coffee Mug, 3/4 full with a raised edge on the bottom (flat bottom)* ≈ 10 kPa (1 kPa) Surface of Mars Air Pressure ≈ 1 kPa Atmospheric Pressure of the Earth: 10 km altitude 100 km altitude ≈ 26 kPa @ 0.1 Pa Normal Atmospheric Air Pressure 1 atm = 101.3 kPa = 14.5 psi Tires of a typical car against the ground (This is also approximately same as the pressure inside the tire)* ≈ 32 psi = 220 kPa Household water pressure* ≈ 250 kPa Hydraulic Elevator Pump* ≈ 300 kPa Under the foot of an Elephant* ≈ 1 MPa Ballet dancer on one foot* ≈ 2 MPa Phonograph stylus tip* ≈ 10 MPa Deep Trenches in Pacific Ocean ≈ 100 MPa Center of the Earth ≈ 4x1011Pa = 4x106atm Center of the Sun ≈ 1015 Pa = 109 atm
* Many of the values above are gauge pressures