燃烧 (rán shāo) is a verb meaning 'to burn' in the physical, chemical sense — referring to combustion, where a substance reacts rapidly with oxygen, producing heat and light. The character 燃 (rán) means 'to ignite' or 'to kindle', while 烧 (shāo) means 'to heat', 'to cook', or 'to burn'. Together, they emphasize the full process of ignition and sustained burning, making the term more formal and scientific than 烧 alone. It's commonly used in contexts like wildfires, fuel combustion, industrial processes, and chemistry.

This word appears frequently in news reports about fires, environmental science discussions (e.g., fossil fuel combustion), safety instructions, and technical descriptions. Unlike the colloquial 烧, which can mean 'to cook' or 'to be feverish', 燃烧 is almost never used for cooking or illness — it’s reserved for actual combustion. It can function as a standalone verb or as part of compound nouns like 燃烧过程 (combustion process) or 燃烧产物 (combustion products).