You are presented with the question "What is an example of an object designed to be cool?" and the following answer choices: 
- a prism
 - cold hands
 - storing water
 - heat sink
 - satellites
 - naturally occurring ice
 - sweating
 - heater

Now knowing that when a cooler object touches a warmer object , thermal conduction occurs and heat sink materials are chosen for their high thermal conductivity, choose the best answer.


 

    heat sink     