* Flammable: This term is used to describe substances that ignite and burn readily at relatively low temperatures.

* Combustible: This term describes substances that require a higher temperature to ignite and burn.

Key points about flammability:

* Flash point: This is the lowest temperature at which a liquid gives off enough flammable vapor to ignite in the presence of an ignition source.

* Autoignition temperature: This is the lowest temperature at which a substance will spontaneously ignite without an external ignition source.

* Flammability limits: These are the upper and lower concentrations of a flammable substance in air, which will support combustion. Below the lower limit, the mixture is too lean, and above the upper limit, the mixture is too rich.

Examples of flammable substances:

* Gasoline

* Ethanol

* Propane

* Natural gas

* Methane

Important Safety Considerations:

* Always handle flammable substances with extreme care.

* Store them in well-ventilated areas, away from heat and ignition sources.

* Use appropriate safety equipment, like fire extinguishers.

* Follow all safety guidelines provided by manufacturers and regulatory agencies.

Understanding flammability is crucial in many fields, including chemistry, safety engineering, and fire science. It's important to be aware of the potential hazards associated with flammable substances and take appropriate precautions.