Energy

Thermodynamics is a branch of physics that deals with heat, work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quantities is governed by the four laws of thermodynamics, which convey a quantitative description using measurable macroscopic physical quantities but may be explained in terms of microscopic constituents by statistical mechanics. Thermodynamics applies to various topics in science and engineering, especially physical chemistry, biochemistry, chemical engineering, and mechanical engineering, as well

use of energy in ways that meet present needs without compromising the ability of future generations to meet their own needs

accounting of the energy flows which determine Earth's surface temperature and drive its climate

physical quantity representing the energy per volume

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energy form not subjected to any human conversion process

flow of energy through a food chain, and is the focus of study in ecological energetics

theoretical upper limit on the energy of cosmic ray protons

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set of systems that encompass the production, conversion, transmission, and distribution of electrical and heat energy

broad scientific subject area which includes topics related to supply and use of energy in societies

Ratio of fusion power produced in a fusion reactor to the power needed to keep it running

the differences of energies of the parent nuclides to the daughter nuclides

Emergy is the amount of energy consumed in direct and indirect transformations to make a product or service. Emergy is a measure of quality differences between different forms of energy. Emergy is an expression of all the energy used in the work processes that generate a product or service in units of one type of energy. Emergy is measured in units of emjoules, a unit referring to the available energy consumed in transformations. Emergy accounts for different forms of energy and resources (e.g. sunlight, water, fossil fuels, minerals, etc.) Each form is generated by transformation processes in

operator in quantum mechanics

Planning and operation of energy production and energy consumption units

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tendency of self-developing systems to maximize energy intake and efficiency

software to monitor and optimize energy consumption in buildings or communities