An engineer measures the air temperature at different heights from the floor of a tall warehouse. The results are recorded in the table below:
Height from floor / mTemperature / ∘C0183196219221223 \begin{array}{|c|c|} \hline \text{Height from floor / m} & \text{Temperature / } ^\circ\text{C} \\ \hline 0 & 18 \\ 3 & 19 \\ 6 & 21 \\ 9 & 22 \\ 12 & 23 \\ \hline \end{array} Height from floor / m036912Temperature / ∘C1819212223Why is the air temperature higher at greater heights from the floor?
Warm air is less dense than cool air, causing it to rise.
Cool air is less dense than warm air, causing it to rise.
The molecules in warm air have less average kinetic energy than those in cool air.
The molecules in cool air are further apart than those in warm air.
73 exam-style questions on CIE IGCSE Physics 2.3.2 Convection. Each one has a worked solution and a mark scheme showing where the marks go.