Question

Give some good reasons why the equation H = AeσT4 is valid only if the temperature is expressed in kelvins (rather than degrees Fahrenheit or Celsius).

Temperature and Heat...conceptual question...will rate on clarity and explanation...thank you!!!

Answer 1

Solution:

The importance of K scale can be given with an example: if the temperature is taken as 0 C then the result of the above formula gives a zero for the H value which is not true. When teh Kelvin scale is used , the value of H derived for o C = 273.5 K is consistent with the experimental values as well.

The following are the reasons for using K scale:

.Kelvin scale of temperature has the coldest temperature possible in the unverse . It is the temperature where all molecular motion ceases at absute zero .

Celsius scale of measurement and Fareheit scales have their lowest temperatures of measurement as the freezing point of water only. , but Kelvin scale has the absolute zero defined.

IN Celsius & Farenheit or rankine etc , the freezing point of water and boiling point of water are taken as the limiting scales.

The molecular theory states that motion of all the molecules ceases at a minimum temperature given as -273 C.

That is the absolute zero on the kelvin scale , which avoids all negative signs .