A given mass of gas has a volume of 
at 
. Calculate its volume at i. 
, ii. 
, iii. 
, the pressure being constant.
Extracted from M. Nelkon. (1971). Graded Exercises and Worked Examples in Physics.
Solution.
Converting cubic centimetres to cubic metres:
.
Converting degree Celsius to Kelvin:
.
Background. (ideal gas equation)
By ideal gas law 
, where 
, 
, and 
are the pressure, volume, and temperature; 
is the amount of substance; and 
is the ideal gas constant.
Wikipedia on Ideal gas law
Arranging 
for change of subject,
.
Then plugging in 
and 
, one obtains
Thus we have volume as a function 
of temperature :
.
We are asked about its volume as the temperature varies:
(to be continued)
