Difference between revisions of "Absolute temperature scale"

Revision as of 20:16, March 5, 2012

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-The term '''absolute temperature scale''' usually refers to the [[Kelvin]] temperature scale, but can also refer to the [[Rankine]] scale. These scales are based on the conventional scales for measuring temperature - [[Celsius]] in most non-US countries and [[Fahrenheit]] in the [[United States]].
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-==Need for an absolute scale==
-Chemists and physicists working with [[gas]]es came to the realization that the conventional temperature scales were not adequate for characterizing the effect of temperature on the decrease in [[volume]] and [[pressure]] of gases with the corresponding decrease in the actual temperature of the gases.
-Ultimately, they realized that if they could decrease the temperature of an [[Ideal Gas|ideal gas]] to a point where all [[molecular motion]] ceased, that would be a good "[[absolute zero]]" point. They found that this temperature would be -273.16 °C (-459.6 °F).
-==Kelvin scale==
-The Kelvin scale, which is based on the Celsius scale, sets the absolute zero point at 0 Kelvin (or just 0K).
-Thus, the melting point of water would be 273.16 K (0°C + 273.16). Likewise, the boiling point of water is 373.16 K (100 °C + 273.16).
-==Rankine scale==
-Like the Kelvin scale, the absolute zero temperature on the Rankine scale is at its zero point - 0°R. However, one degree on the Rankine scale is one degree on the Fahrenheit scale.
-Thus, the freezing point of water would be 491.6 °R (32 °F + 459.6), and the boiling point of water would be 671.6 °R (212 °F + 459.6).
-[[Category:Units of Temperature]]

Difference between revisions of "Absolute temperature scale"

Revision as of 20:16, March 5, 2012

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