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2. Fuel - Wikipedia

   en.wikipedia.org/wiki/Fuel

   Chemical fuels are substances that release energy by reacting with substances around them, most notably by the process of combustion. Chemical fuels are divided in two ways. First, by their physical properties, as a solid, liquid or gas. Secondly, on the basis of their occurrence: primary (natural fuel) and secondary (artificial fuel). Thus, a ...

3. Fossil fuel - Wikipedia

   en.wikipedia.org/wiki/Fossil_fuel

   Fossil fuel phase-out is the gradual reduction of the use and production of fossil fuels to zero, to reduce air pollution, limit climate change, and strengthen energy independence. It is part of the ongoing renewable energy transition , but is being hindered by fossil fuel subsidies .

4. Heat of combustion - Wikipedia

   en.wikipedia.org/wiki/Heat_of_combustion

   The heating value (or energy value or calorific value) of a substance, usually a fuel or food (see food energy), is the amount of heat released during the combustion of a specified amount of it. The calorific value is the total energy released as heat when a substance undergoes complete combustion with oxygen under standard conditions .

5. Fuel gas - Wikipedia

   en.wikipedia.org/wiki/Fuel_gas

   Fuel gas is widely used by industrial, commercial and domestic users. Industry uses fuel gas for heating furnaces, kilns, boilers and ovens and for space heating and drying . The electricity industry uses fuel gas to power gas turbines to generate electricity. The specification of fuel gas for gas turbines may be quite stringent. [5]

6. Energy density - Wikipedia

   en.wikipedia.org/wiki/Energy_density

   For energy storage, the energy density relates the stored energy to the volume of the storage equipment, e.g. the fuel tank. The higher the energy density of the fuel, the more energy may be stored or transported for the same amount of volume. The energy of a fuel per unit mass is called its specific energy.

7. Fuel cell - Wikipedia

   en.wikipedia.org/wiki/Fuel_cell

   Demonstration model of a direct methanol fuel cell (black layered cube) in its enclosure Scheme of a proton-conducting fuel cell. A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) [1] into electricity through a pair of redox reactions. [2]