Question: How does hydrogen work as an energy source?
Answer: Hydrogen gas reacts with oxygen gas to form water and gives off energy in the process. This energy, mostly in the form of heat, can be used as an energy source. Hydrogen fuel cells are specialized to react the hydrogen and oxygen in an optimal way so that maximum energy can be harnessed. The source of the energy is the hydrogen gas that is synthesized in a lab, usually by the electrolysis of water (which means running electrical energy through water causing it to separate into oxygen and hydrogen gas). The energy used to create the hydrogen gas can come from many sources including fossil fuels, solar, hydroelectric, etc.
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