air-conditioning

An air-conditioner is a device that controls the temperature and humidity of a space. 

Air-Conditioners are used to cool down warm spaces in places such as buidlings, cars, and rooms.  


http://capl.washjeff.edu/browseresults.php?langID=2&photoID=4176&size=l

humidity

Humidity is the amount of water vapor in the air. 

Humidity has three ways of being measured, absolute humidity, specific humidity, and relative humidity. 


https://wonderopolis.org/wonder/what-is-humidity

invent

To invent something means to create or design something. 

 The invention of the air-conditioner is used to cool down spaces. 


http://www.caskaip.com.au/services_item/invention-assessment/