Metal cannot catch fire.
To limit the effects of a possible fire.
metal
Metal fires occur when unstable metals are brought to their ignition temperature and there is a source of ignition. For instance, a car fire could ignite certain metallic components used in engines or exhaust systems. Flammable metals include lithium, magnesium, and even shredded or powdered aluminum. Class D fire extinguishers contain chemicals designed to extinguish metal fires.
I dont think there is a metal stored under water because they react with water and instead are stored in kerosene or oil. Water often corrodes the metal producing rust so i cant think of any metal that would be stored under water.
because of the chemicals inside it
They should be locked away in a secure metal cupboard, and the ammunition should be securely stored somewhere else.
To limit the effects of a possible fire.
I've heard of this happening in enclosed spaces where chemicals are stored. If there are corrosive and reactive chemicals in the air of the storage area, they will react with the metal. Ensure all chemicals are stored in airtight containers so that they do not evaporate or disperse into the air. This will mean the chemicals last longer as well.
A penny is made of metal, so is not flammable.
No. Copper is a metal, and not flammable.
Not usually. If the flame is very hot, the metal may melt.
There are a number of chemicals that are very flammable. Some are even explosive. That makes it hard to pick one. Volatile substances that have light molecules are probably the most flammable, and there are a number of things that could compete for the title "most flammable" or something similar.
it can b stored in oil
Scandium is considered a flammable material. Scandium is considered as flammable.
Store this in the refrigerator, but put it in a plastic container. Do not keep it in the metal can.
If the cupboard door is made of metal, you can clean by water sprinkle. If wooden or made of plastic, you can just clean by using table cloth and a liquid.
Paper is more highly flammable. Paper contain organic compounds as cellulose which are very flammable.