For example methane is flammable and reactive.
Yes, some gels are flammable. How flammable would depend on it's alcohol, or flammable substance content. Some gels are not flammable at all, and others a very flammable.
Carbonates are generally not flammable.
DDT is flammable.
Fermium is not flammable.
By hard matirial and crack resistant matirial.
It depends on the matirial, if the matirial is hard to be burned then the fire will not spread fast, and if it's a matirial that can be easily burned (such as wool) the fire will spread very fast.
Flammabe or not flammable:- gold is not flammable- sulfur is flammable
Example: Keep anything FLAMMABLE at a far distance from fireworks.
Brass
For example methane is flammable and reactive.
Markers are of various types and some are flammable for example Krink K42 type pain markers are highly flammable. While amongst the non flammable ones you have, Ultra color non flammable Marker.
denim
chanes earths matirial
steel
Cytoplasm.
flammable means it can catch on fire. some substances that can catch on fire are... wood cloth hair(yuck) carpet