Thermal Physics

9.3 Pressure in Gases

This section covers the following syllabus (Physics 5059) requirements.

  • explain the pressure of a gas in terms of the motion of its molecules
  • recall and explain the following relationships using the kinetic model (stating of the corresponding gas laws is not required):

(i)    a change in pressure of a fixed mass of gas at constant volume is caused by a change in temperature of the gas

(ii)   a change in volume occupied by a fixed mass of gas at constant pressure is caused by a change in temperature of the gas

(iii)  a change in pressure of a fixed mass of gas at constant temperature is caused by a change in volume of the gas

  •  use the relationships in (f) in related situations and to solve problems (a qualitative treatment would suffice)
 Explain the pressure of a gas in terms of the motion of its molecules. Recall and explain the relationships using the kinetic model; a change in pressure of a fixed mass of gas at constant volume is caused by a change in temperature of the gas, a change in volume occupied by a fixed mass of gas at constant pressure is caused by a change in temperature of the gas and use the relationships in related situations and to solve problems a qualitatively.
  Recall and explain the relationships using the kinetic model; a change in pressure of a fixed mass of gas at constant temperature is caused by a change in volume of the gas     use the relationships   in related situations and to solve problems   a qualitatively.

10.3 Radiation

This section covers the following syllabus (Physics 5059) requirements.

  • explain that energy transfer of a body by radiation does not require a material medium and the rate of energy transfer is affected by:

(i) colour and texture of the surface

(ii) surface temperature

(iii) surface area

  • apply the concept of thermal energy transfer (radiation) to everyday applications
 Explain that energy transfer of a body by radiation does not require a material medium and the rate of energy transfer is affected by colour and texture of the surface, surface temperature and surface area.. Apply the concept of thermal energy transfer (radiation) to everyday applications.