Which phenomenon is not caused by thermal expansion?
the cracking of a thick-walled glass mug when boiling water is poured into it
the expansion of a sealed balloon placed inside a vacuum chamber
the rise of a hot air balloon in cool atmospheric air
the buckling of steel railway tracks on an exceptionally hot summer day
96 exam-style questions on CIE IGCSE Physics 2.2.1 Thermal expansion of solids, liquids and gases. Each one has a worked solution and a mark scheme showing where the marks go.