Length and Volume

1 inch = 2.54 cm

1 ft = 30.48 cm

1 m = 39.37 in

1 mi = 1.609 km

Surface Tension N/m

Water (0^oC) = .076

Water (25^oC) = .072

Water (80^oC) = .063

Mercury(20^oC) = .435

Densities kg/m³

Air (0^oC) = 1.29

Air (20^oC) = 1.21

Water = 998

Ice = 920

Sea Water = 1030

Mercury = 13600

Wood = 120 to 870

Aluminum = 2700

Iron = 7870

Brass = 8600

Lead = 11400

Uranium = 18950

Gold = 19300

Mass

1 kg = 2.205 lb

Pressure

1 Pa = 1 N/m²

1 atm = 1.01 x 10⁵ Pa

1 psi = 6895 Pa

1 mmHg = 133.3 Pa