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A chemical property describing something that burns or catches on fire easily is flammable.
There is no reason to use magnesium in light bulbs. Magnesium readily and easily catches fire and burns -- white hot.
The metal that burns readily underwater is sodium. It can ignite easily underwater, and it can be incredibly difficult to extinguish.
Flammability is a chemical property.
One that is readily set alight and burns easily, such as petrol or neat alcohol.
Flammability
Because it burns readily and with a bright flame.
it catches fire
If you burn something it is a chemical change, however if you melt of boil it, it is a physical change.
The magnesium burns readily in air to produce a white ash which is magnesium oxide. This is due to the "oxidation" of the metal.
Something that burns or is flammable would be a chemical change.
There is Chemical, heat, and electrical burns.