It is difficult to reduce the scientific meaning of energy to one or two sentences. There is a good reason for this: energy is an abstract concept that scientists have taken a long time to discover. Although the concept of energy is very general, changes in energy are associated with almost all phenomena...
The scientific meaning of energy is difficult to reduce to one or two sentences. There is a good reason for this: energy is an abstract concept that scientists have taken a long time to discover.
Although the concept of energy is very general, changes in energy are associated with almost all phenomena and processes, but energy is not linked to a single property of matter. For example, we all automatically feel “hot” and associate the concept of temperature with this property of matter, as we associate the concept of force with its applications in propulsion and attraction.
From another angle, energy is associated with many properties or conditions of matter including temperature, strength, motion, atomic level, mass, charge, etc. The fact that the concept of energy is so general makes it difficult to determine precisely what it is.
Another reason it is difficult to define the concept of energy is that the value of energy itself is rarely significant; but it is changes in energy values that matter to us.
In fact, we will see that the change in energy is directly related to the “quantity” of the reaction that took place. This is the root of the energy interaction model, it helps explain how energy changes when a reaction occurs.
Mathematically, the energy conservation statement is written this way:
Δ E total =Q+W
The left side of the equation represents the sum of the types of energy that have changed in the physical system during a given reaction: Etot ? ? E. The right side of the equation represents all the ways in which energy can be added to or removed from the physical system. Energy transfer in the form of Q heat occurs when the system interacts with a different temperature environment. Energy transfer as W action represents all other types of energy transfer that have to do with the net force exerted on or by the system.
These two terms can be used as a working definition of energy:
Energy is an abstract concept that characterizes the interactions of matter.
A change in the energy of a physical system is a quantitative measure of the degree of its interactions with other physical systems.
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Source: Published on Facebook's "Braheen Center" page