What is the definition of a boiler according to the guidelines mentioned?

The definition of a boiler includes its primary function, which is to generate steam or hot liquid for various applications such as heating, power generation, or even process applications in industrial settings. A boiler accomplishes this by heating water or other fluids to their boiling point, transforming it into steam or a heated liquid. This characteristic is fundamental to the operation of a boiler, distinguishing it from other types of vessels or containers that may serve different purposes, such as storage or chemical reaction.

While a vessel in which fuel is burned describes a part of the boiler's operation, it does not encompass the entire functionality that defines a boiler. Similarly, a vessel that stores hot water does not imply the generation of steam, which is central to a boiler's role. A container for chemical reactions is unrelated to the definition of a boiler, as it pertains to a different process altogether. Thus, defining a boiler as a vessel in which steam or hot liquid is generated accurately captures its essential nature and purpose in a variety of industries.