What does the term 'flammability' refer to in chemical properties?

The term 'flammability' specifically refers to a substance's potential to ignite and sustain combustion when exposed to a source of ignition. This characteristic is crucial in the context of hazardous materials because it determines how a substance may behave in the presence of fire or heat. Understanding flammability helps in assessing risks during storage, transportation, and handling of chemicals, thereby ensuring safety protocols are followed to prevent fires and explosions.

The other options describe different properties: corrosion relates to a material’s reaction with substances like acids or bases; vapor density pertains to the weight of vapor compared to air; and reactivity with water involves how substances may respond chemically when in contact with water, which is unrelated to flammability. Recognizing flammability enables effective risk management in dealing with hazardous materials.