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TEMPERATURE CONVERSION

The Celsius (Centigrade) temperature scale is in common use for almost all practical purposes.   However, the kelvin has been selected as the SI unit for temperature.  The kelvin as a unit of temperature is equal to a Celsius unit; however the celsius scale uses the freezing point of water as zero whilst the Kelvin scale is based on absolute zero.  The imperial system uses the fahrenheit scale, based on the freezing point of water as 32° and the boiling point as 212°, the absolute scale using Fahrenheit units is known as the Rankin scale. The following chart expresses the conversion formula and relationship between the four recognised temperature scales.

  Celsius Kelvin Fahrenheit Rankin
  °C °K °F °R
Centigrade   = °C+273.16 = (°C × (1.8)) +32 = (°C x (1.8)) + 491.67
Kelvin = °K - 273.15   = (°K × (1.8)) - 459.67 = °K x (1.8)
Fahrenheit = (°F - 32) ÷ (1.8) = (°F + 459.67) ÷ (1.8)   = (°F + 459.67)
Rankin = (°R - 491.67) ÷ (1.8) = °R ÷ (1.8) = °R - 459.67  

TEMPERATURE TABLE

The following table shows the relationship over a range of temperatures of the four recognised temperature scales, using Celsius as the base.   The main reference temperatures, absolute zero and the freezing and boiling points of water have been highlighted.

Celsius Kelvin Fahrenheit Rankin    Celsius Kelvin Fahrenheit Rankin
°C °K °F °R   °C °K °F °R
-273.160.00-459.690.00   130 403.16 266.00 725.67
-250 23.16 -418.00 41.67   140 413.16 284.00 743.67
-200 73.16 -328.00 131.67   150 423.16 302.00 761.67
-150 123.16 -238.00 221.67   160 433.16 320.00 779.67
-100 173.16 -148.00 311.67   170 443.16 338.00 797.67
-50 223.16 -58.00 401.67   180 453.16 356.00 815.67
-40 233.16 -40.00 419.67   190 463.16 374.00 833.67
-30 243.16 -22.00 437.67   200 473.16 392.00 851.67
-20 253.16 -4.00 455.67   250 523.16 482.00 941.67
-17.78 255.38 0.00 459.67   300 573.16 572.00 1031.67
-10 263.16 14.00 473.67   350 623.16 662.00 1121.67
0273.1632.00 491.67   400 673.16 752.00 1211.67
5 278.16 41.00 500.67   450 723.16 842.00 1301.67
10 283.16 50.00 509.67   500 773.16 932.00 1391.67
15 288.16 59.00 518.67   550 823.16 1022.00 1481.67
20 293.16 68.00 527.67   600 873.16 1112.00 1571.67
25 298.16 77.00 536.67   650 923.16 1202.00 1661.67
30 303.16 86.00 545.67   700 973.16 1292.00 1751.67
35 308.16 95.00 554.67   750 1023.16 1382.00 1841.67
40 313.16 104.00 563.67   800 1073.16 1472.00 1931.67
45 318.16 113.00 572.67   850 1123.16 1562.00 2021.67
50 323.16 122.00 581.67   900 1173.16 1652.00 2111.67
55 328.16 131.00 590.67   950 1223.16 1742.00 2201.67
60 333.16 140.00 599.67   1000 1273.16 1832.00 2291.67
65 338.16 149.00 608.67   1100 1373.16 2012.00 2471.67
70 343.16 158.00 617.67   1200 1473.16 2192.00 2651.67
75 348.16 167.00 626.67   1300 1573.16 2372.00 2831.67
80 353.16 176.00 635.67   1400 1673.16 2552.00 3011.67
85 358.16 185.00 644.67   1500 1773.16 2732.00 3191.67
90 363.16 194.00 653.67   1600 1873.16 2912.00 3371.67
95 368.16 203.00 662.67   1700 1973.16 3092.00 3551.67
100373.16212.00 671.67   1800 2073.16 3272.00 3731.67
110 383.16 230.00 689.67   1900 2173.16 3452.00 3911.67
120 393.16 248.00 707.67   2000 2273.16 3632.00 4091.67

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