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FIRE extinguishers are used to put out fire.
There are several types of fire extinguishers that one should purchase that rely on their compact form and low weight such as Alert 5 Rechargeable fire extinguishers, and Tundra Tundra extinguishers.
Fire extinguishers should be stored and mounted where they are readily accessible on a boat, where they will not be damaged and where they can be inspected regularly.
Where they are readily available
Extinguishers with a Class C rating (C can be used on Currents)
Some fire extinguishers use dry chemicals and some use a foam to extinguish flames. Some fire extinguishers actually still use water, but they're only for use on smaller fires. Others use a dry chemical, mostly sodium bicarbonate, or Carbon Dioxide.
Fire extinguishers!!
No, the chemicals inside fire extinguishers are not food grade. If you need to put out a fire and spray food, you should throw the food away.
You periodically check a fire extinguisher to ensure it will be ready and functional if you need it.
At the base of the fire and use a sweeping motion
There are laws in some countries that make obligatory the use of graphic (pictures) instructions on all fire extinguishers