Flammability is a chemical property. It describes the ability of a substance to burn or ignite, causing fire or combustion. This property is related to the chemical composition of the substance and how it reacts with oxygen in the presence of heat.
Chemical properties are characteristics that can only be observed when a substance undergoes a chemical change or reaction. In the case of flammability, the substance changes into new substances (like ash, smoke, and gases) when it burns. This transformation is a chemical change, which is why flammability is considered a chemical property.
Physical properties, on the other hand, are characteristics that can be observed or measured without changing the substance’s chemical identity. Examples include color, density, and melting point. Since flammability involves a chemical change, it is not a physical property.