Question

What temperature is taken as initial temperature in the measurement of gaseous expansion ? Please tell...​

Answer 1

Answer:

Most literature uses STP, standard pressure at 1 atmosphere and temperature at 0 degrees Celsius. Some take room temperature at 25 degree Celsius. Either way is fine. I prefer the more human sensory suitable 25 degrees for meteorological purposes. Personally I prefer 27 degrees Celsius as that conveniently translates to 300 degree Kelvin or 300K.

For example consider adiabatic compression of air for cooling purposes with pressure times volume raised to the power gamma equal to 1.4. I can raise air temperature by compressing air to about 400K. That's a temperature ratio of 3/4. That raises pressure by somewhere between 2 to 3 atmospheres. If you cool that gas from 400K to 350K first and then you depressurize air back to one atmosphere, air chills significantly. The resulting air temperature drops from 350K to 350 times 3/4 or 264K, below freezing point 273K or zero degrees Celsius

in fact I just invented an A/C doing just that for Example

Explanation:

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Answer 2

Most literature uses STP, standard pressure at 1 atmosphere and temperature at 0 degrees Celsius. Some take room temperature at 25 degree Celsius. Either way is fine. I prefer the more human sensory suitable 25 degrees for meteorological purposes. Personally I prefer 27 degrees Celsius as that conveniently translates to 300 degree Kelvin or 300K.