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What is a boiler defined as?

  1. A closed tank for liquid storage

  2. A device that generates electricity

  3. A closed vessel in which water or other liquid is heated

  4. A structure for chemical reactions

The correct answer is: A closed vessel in which water or other liquid is heated

A boiler is defined as a closed vessel in which water or another liquid is heated, transforming it into steam or another form of energy. This definition highlights the primary function of a boiler, which is to produce steam or hot water for various applications, such as heating systems, power generation, and industrial processes. The emphasis on being a closed vessel is crucial, as it allows for the management of pressure and temperature within the system, ensuring safe and efficient operation. Understanding this definition is fundamental for anyone working with boilers, as it distinguishes them from other systems used for storing liquids or facilitating chemical reactions. The other options do not accurately encompass the function and design characteristics intrinsic to what a boiler is.