Conversion Factors
Multiply	By	To obtain
Liters	0.22009	Gallons (U.K.)
Liters	1.76072	Pints
Meters	3.2808	Feet
Meters	1.093614	Yards
Metric Tonnes	0.98421	Tons (U.K.)
Miles	1.609343	Kilometers
Millimeters	0.03937	Inches
Ounces	28.34953	Grams
Pints	0.56795	Liters
Pounds	0.4536	Kilograms
Square Centimeters	0.15500	Square Inches
Square Feet	0.09290	Square Meters
Square Inches	6.45163	Sq. Centimeters
Square Kilometers	0.386102	Square Miles
Square Meters	0.0002471	Acres
Square Meters	10.76387	Square Feet
Square Meters	1.19599	Square Yards
Square Miles	640.00	Acres
Square Miles	2.58999	Square Kilometers
Square Yards	0.83613	Square Meters
Tons (U.K.)	1.01605	Metric Tonnes
Tons (U.K.)	1016.0470	Kilograms
Yards	0.914399	Meters
Acres	0.404686	Hectares
Acres	4047.00	Square Meters
Acres	0.001562	Square Miles
Centimeters	0.393701	Inches
Cubic Centimeters	0.061024	Cubic Inches
Cubic Feet	6.228	Gallons
Cubic Feet	0.02832	Cubic Meters
Cubic Inches	16.3871	Cubic Centimeters
Cubic Meters	35.31445	Cubic Feet
Cubic Meters	1.30794	Cubic Yards
Cubic Yards	0.76456	Cubic Meters
Feet	0.3048	Meters
Gallons	0.1337	Cubic Feet
Gallons (U.K.)	4.5461	Litres
Grams	0.03527	Ounces
Hectares	2.47105	Acres
Horse power	0.7457	Kilowatts
Inches	2.539998	Centimeters
Inches	25.39998	Millimeters
Kilograms	2.204620	Pounds

Values of some constants

1. Speed of light (c) = 2.9979 ´ 108 ms-1 (metres per second) 2. Avogadro’s number (N) = 6.022 ´ 102 3 mol-2 (per mole) 3. Mass of an electron (me) = 9.1095 ´ 10- 31 Kg 4. Mass of a proton (mp) = 1.6726 ´ 10-27 Kg 5. Mass of a neutron (mn) = 1.6748 ´ 10-27 Kg 6. Gas constant (R) = 8.3144 JK-1 mol-1 (joules per kelvin per mol)