Answer:
The by-product of hydrogen fuel is heat and pure water
Step-by-step explanation:
The by-product of hydrogen fuel is heat and pure water
By-product is a secondary product derived from a production process, manufacturing process or chemical reaction, it is not the primary product or service being produced.
however hydrogen fuel cell combines hydrogen and oxygen to produce electricity, heat, and water but it primary aim is to produce electricity therefore is by-product are heat and pure water