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.
There is equipment that connects from the gas tank to the fire extinguisher, and is deigned to keep from overpressurizing the extinguisher. Do NOT try this without the equipment.
You need to use a Class B extinguisher on flammable liquids.
Fire extinguisher
A class C fire extinguisher is used for electrical fires. A all purpose A, B, C extinguisher can also be used.
Yes. They are rated for the type of fire they can be used against, and the capacity of the extinguisher.
Only the type of fire that is highlighted
Read the label on the extinguisher.
Read the label on the extinguisher.
A Class C fire extinguisher should be used for electrical fires.
They can get very damaged and even broken if the fire extinguisher hits them
A Class A fire extinguisher should be used specifically for wood fires.
What 'type' the fire is. The right extinguisher must be used for any fire. Or, more importantly - it can be very dangerous to use the wrong type of extinguisher, such as one with water should never be used on an electrical fire.