Nitrogen can be used in fire extinguishers as gas propellant.
N2, you know nitrogen gas
it depends how big the fire is
Because nitrogen gas bigest quantity in air.
Indefinite. Usually they are tested & certified annually.
A pure CO2 fire extinguisher is recharged by pouring in liquid C02. It usually takes a professional refilling company to determine the proper amount and to pour it in safely. Dry ice, crushed to get it into the extinguisher tank, can also be used.
You can fill a fire extinguisher with any substance you like. Whether it will work as a fire extinguisher afterwards is a different matter. The old pump-style water fire extinguishers in college dormitories have occasionally been found to contain beer (which at least still works for the intended purpose) or gasoline (which is not so effective), which is one reason you don't see that type so much anymore.
A fire extinguisher is meant to extinguish a fire, or at least a portion of the fire within the fire extinguisher's capacity.
Co2 is one of them. There are many others, including air, nitrogen and halogenated hydrocarbons.
how does a fire extinguisher work
A Class C fire extinguisher.
A Class C fire extinguisher.