What is the definition of combustion?

The definition of combustion is indeed a chemical process of oxidation that occurs at a rate fast enough to produce heat and usually light in the form of either a glow or flame. This definition captures the essence of combustion as it highlights several key characteristics: the chemical reaction primarily involves oxidation, which typically involves the reaction of a fuel with oxygen. The emphasis on the rate of the reaction is crucial since combustion must occur quickly to emit noticeable heat and produce light, distinguishing it from slower oxidation processes. The mention of glow or flame further clarifies the visible outcomes of a successful combustion event, making it clear that combustion is an energetic process.

The other choices do not adequately capture the definition of combustion. For example, a slow reaction that produces minimal heat is characteristic of certain oxidation processes but does not meet the criteria for combustion, which by definition is rapid and produces significant heat. A type of fire that does not release light would not accurately describe combustion, as combustion is defined by its ability to produce light, often in the form of flames. Lastly, a process where materials evaporate without burning refers to physical change (phase change) rather than a chemical change, which further distinguishes it from the definition of combustion.