Energy Definition in Science

Energy in physics, defined as an ability which transformed, produced, or doing work. In various natural facts of science, energies are different types, such as kinetic, potential, thermal, electrical, mechanical, internal, chemical, nuclear power, electromagnetic spectrum, surface energy, etc. Energy conservation in thermodynamics define, it can neither be created nor be destroyed but it may transfer one body form to another. Heat or specific heat also another form of energies that yields or produces work and transferred one body to another. But heat is different from other sources of energy like chemical, mechanical or electrical because all the other forms completely converted into work but heat can not be wholly converted into work.

Another facts of heat energy in learning chemistry or physics, when two objects with different temperatures come together, heat transit or flows from lower temperatures to higher temperatures.

Energy like kinetic, potential forms in physics, is the ability to transformed produced heat or doing thermal, mechanical types of work in science

Kinetic energy defines another form producing by the motion of objects or particles in physics. It works on an object or particles, the object speeds up by gaining kinetic motion. The potential energy formula in science was described first in 19th-century Scottish engineer and physicist William Rankine to define various forms of potential energies held by an object. For examples of potential energy, displacing spring from its equilibrium position, lifting of the weight, turning of the blades in the wheel, etc.

Examples of Work and Energy

The usual convention in thermodynamics, work obtained from the system during the change regarded as positive where work is done on the system by an outside agency negative. For the more precise meaning of work and energy, we recall some relevant examples like oxidation or burning of coal or natural gas produces heat which ultimately enables the engine working. The mechanical work spent in rubbing two crystalline solid blocks of ice generates a large quantity of heat. Therefore there has an intimate relation between heat, and work, one can yield the other quantity. Energy is an extensive thermodynamics property like volume or surface area because it depends on the mass of the system. On the other hand, intensive properties like temperature, pressure, density, refractive index, etc are independent of the mass of the system.

Units of Heat or Work

Physical quantities like heat, energy like potential or kinetic, and work describe or express in terms of base physical units or dimensions by multiplication or division. The unit and dimensions of heat, various kinds of energy, or work can easily derive from the scientific definition or base mathematical formula. For example, work, W = F × s, where force (F) = maas × acceleration and acceleration = length sec-2. Hence, W = mass length2 sec-2. Therefore, the CGS and SI unit of work or heat = gm cm2 sec-2 or simply erg and kg m2 sec-2 or simply joule, another most used unit for energy is calories, kilocalories, eV, liter-atmosphere, etc.

Heat Energy Conversion

Heat is another kind of energy converted into all the other forms like electrical, chemical, mechanical, kinetic, or potential by producing work. But heat cannot be completely converted into work because any attempt to convert whole heat into work permanently changes the system or neighboring system. Another facts for learning chemistry or physics, when two objects with different temperatures come together, one with a higher temperature losses heat, and the other gains it.

The production or conversation of heat into work or energy going through a definite process, for example, when a liquid molecule freezes into solid yielding heat or water freezes into ice producing specific heat. Common examples for study heat energy conversation, redox reaction between chemical elements zinc and copper sulfate, expansion of stem, the glow of yellow phosphorus, combustion of petroleum fuel, or hydrocarbon. All the above types of examples, producing heat or work used for daily used energy for our environment and every system has within itself done some quantity of internal work in chemistry or physics.


Helium, chemical symbol He, the second most abundant group-18 chemical element of the periodic table chemical in the earth universe is noble gas and liquid


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Activation energy formula graph in chemistry for atoms or molecule to active before activated complex formation

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