- air-conditioning
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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
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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
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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/