Tag: solar energy and its applications

In chulhas, gaps are left between the logs are there to to decrease the ignition temperature of the fuel

Fire is indeed a chemical process of combustion, which is an exothermic reaction between a fuel and an oxidant.

Coal is a fossil fuel formed from the remains of ancient vegetation that was buried and subjected to heat and pressure over millions of years.

A) Petroleum

A chemical reaction produces energy (exothermic) when the potential energy of the products is lower than that of the reactants, meaning the energy released by forming product bonds is greater than the energy absorbed to break reactant bonds.

The energy possessed by fossil fuels such as coal, petroleum and natural gas is called the chemical energy or fuel energy. These fuels contain chemical energy stored in them.

Fossil fuels are combustible fuels with high and rapid combustion rate.

Anaerobic decomposition of dead animals and plants along with exposure to Earth's heat and pressure resulted in buried source of energy: fossil fuels.

Coal is a fossil fuel which is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. Coal is composed primarily of carbon, along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. A fossil fuel, coal forms when dead plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal, and lastly anthracite. This involves biological and geological processes that take place over time. Throughout history, coal has been used as an energy resource, primarily burned for the production of electricity and heat, and is also used for industrial purposes, such as refining metals. Coal is the largest source of energy for the generation of electricity worldwide, as well as one of the largest worldwide anthropogenic sources of carbon dioxide releases. The extraction of coal, its use in energy production and its byproducts are all associated with environmental and health effects including climate change.

A non-renewable resource (also called a finite resource) is a resource that does not renew itself at a sufficient rate for sustainable economic extraction in meaningful human time-frames.
Fossil fuels are non renewable resource.
Wind and wood are renewable  as their localized replenishment can occur within time frames meaningful to humans.