a. The illustrations show a beaker in which coffee is served at an airport kiosk.

The beaker itself is made of two layers of cardboard. It has a thin plastic lid.

i. State two sources of heat loss that are reduced by the lid.

ii. State two reasons why the layer of corrugated cardboard stops the fingers of the person holding the beaker from becoming uncomfortably hot.

b. i. State the meaning of the term thermal capacity.

ii. Another airport kiosk serves coffee in pottery mugs. The mugs all have the same internal dimensions but some have a high thermal capacity and some have a low thermal capacity. When hot drinks are poured into the mugs, the temperature of the drink always drops because of the thermal energy absorbed by the mug. State which mug, high thermal capacity or low thermal capacity, causes the least fall in temperature of the hot drink, and explain why.

Transcribed Image Text:

section through beaker layer of corrugated cardboard stuck to a layer of smooth cardboard, with air trapped between them