Water vapor cooling causes that water vapor to condense, and all carcasses are chilled with cool air for 48 hours. Given these facts, what causes water vapor to condense among the following options:
- water vapor exploding
 - water vapor heating up
 - water vapor disappearing
 - circulatory systems
 - aqueous solution
 - Heat energy
 - water vapor chilling
 - Evaporation


 

       water vapor chilling  