(a)[1]
State what happens to material Z when the hot coffee is poured into the cup.
(b)[5]
Explain how the cup’s features allow the coffee to stay at 60 ^{\circ}C for a long time. plastic lid vacuum shiny outer steel wall material Z
Physics 0625 · IGCSE · Thermal properties and temperature
Thermal properties and temperature — practice question
Researchers have discovered that 60 ^{\circ}C is the ideal temperature for drinking coffee.
A designer has created a new kind of cup designed to keep coffee at 60 ^{\circ}C. The cup is illustrated in Fig. 8.1.
Material Z has a melting point of 60 ^{\circ}C. At room temperature, material Z is in the solid state.
Coffee at 90 ^{\circ}C is poured into the cup. The coffee then cools quickly to 60 ^{\circ}C.