Dew is formed when water vapor condenses over night, and condensation on roofs at night is common in cooler weather. Given these facts, dew is formed when water vapor is what among the following options:
- uncontrolled
 - smoked outdoors
 - frozen at once
 - major threat to health
 - aqueous solution
 - It gets heated up
 - cooled at night
 - chilled inside


 

       cooled at night  