There are five temperature scales one might encounter, but only the first three listed here are of any current significance. Here is a handy calculator to convert between any of these. Specific definitions of each scale are given in the next section. Additional Info: Many of the items you will find on an MSDS come in both English (U.S. Customary System) and metric (International System or SI or cgs) units. The metric system has been adopted by almost every country except the United States. Even in the U.S., scientists and technical people use the metric system because of its ease of use. Temperature Scales, Notable Temperatures on the Various: Absolute Zero: -459.67 Fahrenheit °F, 0 Rankine °R, -273.15 Celsius °C, 0 Kelvin °K, -218.52 Réaumur °Ré; Liquid N2 Boils at: -320.4 °F, 139.25 °R, -195.79 °C, 77.45 °K, -156.63 °Ré; CO₂ Sublimes at: -109.26 °F, 350.41 °R, -78.48 °C, 194.67 °K, -62.78 °Ré; Water Freezes at: 32 °F, 491.67 °R, 0 °C, 273.15 °K, 0 °Ré; Human Body T: 98.60 °F, 558.27 °R, 37 °C, 310.15 °K, 29.6 °Ré; Water Boils at: 212 °F, 671.67 °R, 100 °C, 373.15 °K, 80 °Ré; Gold Melts: 1,949 °F, 2,408 °R, 1,065 °C, 1,338 °K, 852 °Ré; Gold Boils at: 4,892 °F, 5,352 °R, 2,700 °C, 2,973 °K, 2,160 °Ré. Note: All measurements are at 1 atm of pressure. See also: Boiling Point and Freezing. Fahrenheit Scale: This scale sets the freezing point of water to 32 degrees Fahrenheit and the boiling point of water to 212 degrees Fahrenheit. A change of 1 degree Fahrenheit equals a change of 5/9 = 0.56 degrees Celsius. To convert a Fahrenheit temperature to Celsius, subtract 32 and multiply by 5/9