LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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• 1 degree C = 1 degree F * 100 / 180 = 1 degree F * 5 / 9
• we can convert from the temperature on the Fahrenheit
scale (TF) to the temperature on the Celsius scale (TC) by
using this equation: TF = 32 + (9 / 5) * TC
• Of course, you can have temperatures below the freezing
point of water and these are assigned negative numbers.
When scientists began to study the coldest possible
temperature, they determined an absolute zero at which
molecular kinetic energy is a minimum (but not strictly
zero!). They found this value to be at -273.16 degrees C.
Using this point as the new zero point we can define
another temperature scale called the absolute
temperature. If we keep the size of a single degree to be
the same as the Celsius scale, we get a temperature scale
which has been named after Lord Kelvin and designated
with a K. Then: K = C + 273.16
• There is a similar absolute temperature corresponding to
the Fahrenheit degree. It is named after the scientist
Rankine and designated with an R: R = F + 459.69
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