Which of the following is a direct consequence of thermal expansion?
a wooden door swelling up during a humid, rainy season
a copper hot water pipe lengthening and creaking when hot water flows through it
chocolate melting when left inside a pocket on a warm day
dew forming on grass in the early morning
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.