TAP 601- 8: Changing pressure and volume by changing
temperature
Pressure and volume of gases increasing with temperature
Constant volume
Constant pressure
1
2
4
3
pressure p
45.1
45.1
volume V
T/C
T/C
heat gas:
pressure
increases
–273
heat gas:
volume
increases
0
temperature/C
–273
0
temperature/C
Pressure and volume extrapolate to zero at same temperature –273.16 C
So define this temperature as zero of Kelvin scale of temperature, symbol T
0
273
temperature/K
pressure proportional to Kelvin temperature
273
temperature/K
volume proportional to Kelvin temperature
pT
VT
0
Pressure and volume proportional to absolute temperature
This diagram shows how temperature affects pressure and volume, suggesting extrapolation
to absolute zero. In turn this provides a basis for the absolute zero of temperature.
Practical advice
These diagrams are reproduced here so that you can discuss them with your class.
External reference
This activity is taken from Advancing Physics chapter 13, 20O