Chemical energy.
The energy stored in oil and coal is stored as chemical energy. This energy is released when the substances are burned or oxidized.
chemical energy
Fuels such as oil, wood, coal, and natural gas have energy stored in them. This kind of energy is called chemical process of burning, the energy is released in the form of heat.
All kind of energy (solar, wind, biomass, geothermal, coal, oil, natural gas) except energy of water falls.
Approximately 1,800 pounds of coal yield the same amount of energy as one barrel of oil. This is because coal has a lower energy density compared to oil, requiring a larger quantity of coal to produce the same amount of energy.
By burning them
potential energy
No, coal is not an alternative energy source. "Alternative" energy sources means energy sources other than fossil fuels (coal, oil, and natural gas).
coal and oil i think
For energy sources.
oil, coal and posphite
gas oil and coal