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Energy (from Ancient Greek ἐνέργεια (enérgeia) 'activity') is the quantitative property that is transferred to a body or to a physical system, recognizable in the performance of work and in the form of heat and light.
Instead of each type of physical thing having its own specific tendency to a way of moving or change, as in Aristotle, Leibniz said that force, power, or motion itself could be transferred between things of different types, in such a way that there is a general conservation of this energy.
It was argued for some years whether energy was a substance (the caloric) or merely a physical quantity. [ citation needed ] The development of steam engines in the 18th century required engineers to develop concepts and formulas that would allow them to describe the mechanical and thermal efficiencies of their systems.
Other areas of focus include the nature of physical laws, symmetries, and conservation principles; the role of mathematics; and philosophical implications of emerging fields like quantum gravity, quantum information, and complex systems. Philosophers of physics have argued that conceptual analysis clarifies foundations, interprets implications ...
However this is not the whole story, in reality energy is not so arbitrarily defined: in general relativity the seat of the curvature of spacetime is the energy content and there the absolute amount of energy has real physical meaning. There is no such thing as an arbitrary additive constant with density of field energy. Energy density curves ...
"For those who want some proof that physicists are human, the proof is in the idiocy of all the different units which they use for measuring energy." - Richard Feynman "The energy produced by breaking down the atom is a very poor kind of thing. Anyone who expects a source of power from the transformations of these atoms is taking moonshine."
Use these education quotes in a back-to-school social media post or write one in an encouraging ... These 35 Inspiring Quotes About Education Remind Us Why Learning at Any Age Is a Beautiful Thing.
Life and Energy is a 1962 book by Isaac Asimov. It is about the biological and physical world , and their contrasts and comparisons. Thus the book is divided into two sections, which is separated by further sub-sections (i.e. chapters): 1) energy; 2) body.