During a fire, you can primarily observe chemical energy and thermal energy (which is related but not listed as one of your specified forms of potential energy).
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Chemical Energy: The fire begins when the chemical bonds in fuels (like wood, paper, or gasoline) break during combustion. This releases energy in the form of heat and light as the molecules rearrange to form new substances (like carbon dioxide and water).
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Thermal Energy: While not specified in your list, it is worth noting that the combustion process generates thermal energy, which is the heat produced by the fire. This thermal energy is a result of the chemical reactions taking place.
The other forms of energy listed, such as nuclear energy, elastic energy, and gravitational energy, are not directly relevant to the process of a fire. In summary, the most observable form of potential energy during a fire is chemical energy, as it is converted into thermal energy and light.