Keeping cool

This task is about properties that keep things hot or cold.

Question 1Change answer

200 mL of water at 18°C was put into each of four containers. The containers were placed side by side in the sunlight for 10 minutes. The temperature of the water in each container was then recorded.  

Thermometer


200 mL water at 18° C 

Temperature after 10 min
Shiny container 
20°C
Dull container 
23°C
Black container 
24°C
White container 
21°C
 
Use the information from the experiment above to answer the questions.
 
a) Whare is going camping. He wants to paint his water container so that the water inside will stay as cool as possible. 
i)  Should he use black or white paint? blackwhite
ii) Should he use a gloss (shiny) or a matt (dull) paint? gloss/shinymatt/dull

Question 1Change answer

b)  The tank holding the petrol is made out of shiny unpainted metal.
 
 

     Explain why this helps prevent heat absorption.

Question 1Change answer

c)  In hotter climates people tend to wear light coloured clothing. 

     What is the reason for this?