oxygen to breath, food for energy and sleep for regeneration but all humans use these 3 things
Fire has to have 3 things to keep burning: Fuel, Heat, Oxygen. Water works by cooling the temperatur and removing the Oxygen.
"Courageous firefighter" isn't a word.
A firefighter extinguishes fire to keep people safe.
Firefighter, scientist, industrial cleaner, miner etc things with fumes dust and smoke
A firefighter can use an infrared camera/viewer for several things, primarily for finding people trapped in a dark or smoke-filled room (where ordinary visibility is zero), and for finding hot spots behind structural members, where fire may be hidden.
foam
a basic firefighter does not use any math but if you are an EO (Engine operator) yes you with use math because you have to do pump operations and hydraulics.
Fire Sciences
a firefighter
yes
i think... water hose fire extinguisher sand CO2 Gas Foam just a guess :)
The plural of fireman is firemen. If you want to use inclusive language, then you can say firefighter and firefighters.