Question 4
Figure 4 shows a thermal bag used during pizza delivery to keep pizzas warm for a few hours. The inner layer is made of foam and lined with a layer of aluminium.
(a) Explain how the design features of the bag help keep the pizza warm for a long period of time. [2.5 marks]
(b) A man wants to keep the pizza in the refrigerator so he can reheat and eat it the next day. He placed the pizza with the bag into his refrigerator to keep the pizza fresh. Should he keep the bag open as shown or zip up the bag? Explain. [2.5 marks]
(a) Explain how the design features of the bag help keep the pizza warm for a long period of time. [2.5 marks]
(b) A man wants to keep the pizza in the refrigerator so he can reheat and eat it the next day. He placed the pizza with the bag into his refrigerator to keep the pizza fresh. Should he keep the bag open as shown or zip up the bag? Explain. [2.5 marks]