In solids, the rate at which the burning surface recedes as it combusts. Affected by pressure, temperature and the scrubbing of hot gases.

The rate at which combustion proceeds across a fuel. A specialised use of this term, describes the rate at which the surface of a pool or burning liquid recedes. For gasoline, this rate is reported to be approximately 1/4 inch per minute.

Rapidity with which a powder burns, relative to other powders. The burning rate will dictate the type of firearm it can be used in, as well as the application.

A relative term used to rank the rapidity with which a given powder releases energy in comparison with other powders. Typically based on heat generation in a lab device called a calorimeter bomb. In a real-world gun system, buring rates may vary depending on factors such as case size, pressure range, expansion ratio, and others. Burning rates charts are furnished for reference only and should never be used for developing loads without the assisatance of industry pressure equipment.

Rate at which a propellant and other combustibles burn.

The relative speed at which a propellant powder burns in comparison to other powders in a controlled combustion chamber.