Gas

Mass Conversion Factors
1 g  = 1 x 10^-3 kg
1 g  = 1 x 10⁺⁹ ng
1 mg = 1 x 10^-6 kg
1 mg = 1 x 10^-3 g
Length Conversion Factors
1 cm           = 1 x 10^-2 m
1 mm           = 1 x 10^-3 m
1 nm           = 1 x 10^-9 m
1 micrometer   = 1 x 10^-6 m
1 angstrom     = 1 x 10^-10 m
1 angstrom     = 1 x 10^-8 cm
1 angstrom     = 100 pm
1 angstrom     = 0.1 nm
1 in           = 2.54 cm (exactly)
1 in           = 0.0833 ft
1 cm           = 10 mm
1 cm           = 1 x 10^-2 m
1 cm           = 0.39370 in
1 mi           = 1.609 km
1 m            = 39.37 in
1 m            = 3.281 ft
Volume Conversion Factors
1 L  = 1 x 10^-3 m³
1 L  = 1000 mL
1 L  = 1000 cm³
1 L  = 1 dm³
1 cm³ = 1 mL
1 cm³ = 1 x 10^-6 m³
1 cm³ = 0.001 dm³
1 cm³ = 1000 mm³

Pressure Conversion Factors
1 atm  = 101,325 Pa
1 atm  = 101.325 kPa
1 atm  = 760 torr
1 atm  = 760 mm Hg
1 atm  = 29.9213 in Hg
1 atm  = 14.70 lb/in²
1 atm  = 1.01325 bar
1 atm  = 1013.25 mbar
1 torr = 1 mm Hg
1 torr = 133.322 Pa
1 torr = 1.33322 mbar
1 bar  = 1 x 10⁺⁵ Pa
1 bar  = 1000 mbar
1 bar  = 0.986923 atm
1 bar  = 750.062 torr