Fact 1: When a cooler object touches a warmer object , thermal conduction occurs.

Fact 2: Heat sink materials are chosen for their high thermal conductivity.

Given the two facts above, answer the question "What is an example of an object designed to be cool?" with the following options: 
- a prism
 - cold hands
 - storing water
 - heat sink
 - satellites
 - naturally occurring ice
 - sweating
 - heater


 

    heat sink     