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Which temperature is colder 0 degrees Fahrenheit or 200 Kelvin?
200 kelvin is much colder than 0 degrees F (200 kelvin = -99.67 F).
Is a kelvin equal to a Celsius?
Units are the same. Temperatures in kelvin are 273 more than celsius temperatures.
Why do scientists use the Kelvin and Celsius scale rather than the Fahrenheit scale?
Celsius is a very accurate measurement between the freezing and boiling points of water. 0 being freezing, and 100 boiling. Kelvin is the measurement of absolute zero, where particles stop moving altogether. Kelvin has the same conversion rating, only 0 Kelvin is -273 degrees Celsius. The Kelvin scale is an absolute scale. This means that 2 K is twice as hot as 1 K and so on. Neither the Celsius nor the Fahrenheit scales do that. The Centigrade (or Celsius scale are based on the freezing and boiling points of water (at normal pressure), the Fahrenheit scale was not: the 0 was the lowest temperature attained by ice and salt.
Is 100 degrees Kelvin the same as 100 degrees Celsius?
No. (Note that you don't say "100 degree Kelvin"; "100 Kelvin" is correct.) 100 Kelvin is about 273 degrees (Kelvin or Celsius) less than 100 degrees Celsius.
Why is the kelvin scale used rather than the celsius scale?
Because the Kelvin scale is an absolute scale. In the context of thermodynamics, 2 K is twice as "hot" as 1 K. And 3 K is three times as "hot". That is not true of the Celsius or Fahrenheit (or other temperature) scales.
