Depends On How You Measure It.

Temperature Conversion

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Convert Fahrenheit scale to Celsius scale The basic formula is Tc = (5/9)*(Tf-32) Where; Tc = temperature in degrees Celsius, Tf = temperature in degrees Fahrenheit For example, suppose you have a Fahrenheit scale temperature of 98.6 degrees and you wanted to convert it into degrees on the Celsius scale. Using the above formula, you would first subtract 32 from the Fahrenheit temperature and get 66.6 as a result. Then you multiply 66.6 by five-ninths and get the converted value of 37 degrees Celsius. Convert Celsius scale to Fahrenheit scale The basic formula is Tf = (9/5)*Tc+32 Where; Tc = temperature in degrees Celsius, Tf = temperature in degrees Fahrenheit For example, suppose you have a Celsius scale temperature of 100 degrees and you want to convert it into degrees on the Fahrenheit scale. Using the stated formula, you first multiply the Celsius scale temperature reading by nine-fifths and get a result of 180. Then add 32 to 180 and get the final converted result of 212 degrees on the Fahrenheit scale. Convert Celsius scale to Kelvin sacle The basic formula is t °C = (t + 273.15) K Tk = (Tc + 273.15) Where; Tk = temperature in Kelvin, Tc = temperature in degrees Celsius. Celsius The Celsius temperature scale is still sometimes referred to as the "centigrade" scale. Centigrade means "consisting of or divided into 100 degrees;" the Celsius scale, devised by Swedish Astronomer Andres Celsius (1701-1744) for scientific purposes, has 100 degrees between the freezing point (0 C) and boiling point (100 C) of pure water at sea level air pressure ( 29.92 inches of mercury). That pressure criteria is often called an atmosphere, or more commonly, standard pressure. The term Celsius was adopted in 1948 by an international conference on weights and measures. Fahrenheit The Fahrenheit temperature scale is used primarily in the United States. The Fahrenheit scale is open-ended, however the primarly ranges from 32 to 212 degrees, 32 is freezing and 212 is boiling of pure water at sea level air preasure ( 29.92 inches of mercury). That pressure criteria is often called an atmosphere, or more commonly, standard pressure. Zero degrees Fahrenheit was the coldest temperature that the German born scientist Gabriel Daniel Fahrenheit could create with a mixture of ice and ordinary salt. He is credited with the invention of the mercury thermometer and introduced it and his scale in 1714 in Holland, where he lived most of his life. His thermometer was based on the original design papers by Galileo for a temperature and pressure measuring device. Kelvin A scale of temperature measurement used primarily in special measurements requiring precision at near absolute. The word degree is not used with the Kelvin scale. The Kelvin scale was invented by William Thomson, also known as Lord Kelvin, a British scientist who made important discoveries about heat in the 1800's. Scientists have determined that the coldest it can get, in theory, is minus 273.15 degrees Celsius. This temperature has never actually been reached, though scientists have come close. The value, minus 273.15 degrees Celsius, is called absolute zero. At this temperature scientists believe that molecular motion would stop. The Kelvin scale uses this number as zero. To get other temperatures in the Kelvin scale, you add 273 degrees to the Celsius temperature. General Most measurements worldwide are in Celsius, except in the chip manufacturing process where Kelvin is used. Other Scales Several other scales exist, though no longer used. One invevted by R A F de Réaumur (1683-1757) a French scientist. Based on freezing point of water as his zero mark, and the boiling point at 80 degrees. Another by W J M Rankine (1820-1872), a Scottish engineer, created his scale, which was merely the Kelvin scale using the Fahrenheit degree instead of Celsius. Relative Scale Ranges Scale Factor °C °Réaumur °F K °Rankine Boiling point of water at 1 atmosphere 100 80 212 373.15 671.67 Freezing point of water at 1 atmosphere 0 0 32 273.15 491.67 Additional Formulas t °C = (t + 273.15) K b °Réaumur = (5/4)b °C = [32 + (9/4)b] °F a °C = (4/5)a °Réaumur = [32 + (9/5)a] °F c °F = (5/9)(c - 32) °C = (4/9)(c - 32) °Réaumur TK K = (TK - 273.15) °C = [1.80 * (TK - 273.15) + 32] °F = 1.80 TK °Rankine Table of formulas

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