A takeaway soup container is made of double-walled paper with a small air gap between the two layers, and has a tight-fitting thin plastic lid.
State two mechanisms of heat transfer from the soup that are reduced by the presence of the lid.
Explain how the double-walled structure with the air gap prevents the outside of the container from becoming too hot to hold. State two reasons.
State the definition of the term thermal capacity.
In a restaurant, hot soup is served in bowls of identical size. Some bowls are made of heavy stoneware, which has a high thermal capacity, while others are made of light porcelain, which has a low thermal capacity.
State which type of bowl (high thermal capacity or low thermal capacity) causes the least reduction in the temperature of the soup when first poured, and explain why.
62 exam-style questions on CIE IGCSE Physics 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.