The energy principle (or law of conservation of energy) is the first law of thermodynamics, which postulates that energy cannot be created or destroyed, only transformed from one form to another. One example is an object falling from a height; when it is high up, it has a higher potential energy, while it falls the potential energy is converted to kinetic energy, and when the object hits the ground kinetic energy is converted primarily to thermal energy (temperature increases) through external and internal friction. Object (and also the crash site) is deformed and this deformation also is what remains of the process since the heat subsided, an application of ” technology ” (intentional rather than accidental deformation) that is, the transfer of energy.
Those who are trying their best to write a successful research paper on conservation of energy should know that the Greek philosopher Thales of Miletus (635 BC – 543 BC) can probably be considered one of the first to imagine that nature has some form of preservation. He was the first known who tried to explain the diversity of nature with nothing inside and outside it.
But the energy principle was first formulated by the German physician Julius Robert von Mayer (1814-1878) in his article “Bemer King über die Kräfte unbelebten der Natur” in the journal Annalen der Chemie und Pharmacie, 43, 233 (1842). The discovery was made when he was on a sea voyage, when he found that some patients had more red blood because they consumed less oxygen, in order to maintain a higher body temperature in colder climates. He realized that heat and work are two variations of energy, and could later calculate quantitative relationships when he had begun to understand the physics. The following year, in 1843, James Prescott Joule arrived at the same conclusions in his experiments.
The energy principle is an empirically based physical law which postulate that energy can neither be created nor destroyed, it can only be transformed from one form to another. For a closed system, this means that the total energy is unchanged with time, while for an open system this means that the balance of supplied and abducted energy is exactly equal to the exchange of the system’s internal energy. The law of conservation of energy cannot be proved but is based on numerous experiments and observation all indicating that the total energy remains constant. A machine that hypothetically violates this law of nature is usually called perpetual motion machine of the first kind.
The law of conservation of energy is formulated and written mathematically in numerous scientific disciplines. The first principle of thermodynamics is an expression of the energy principle which postulates that the amount of heat applied is equal to the amount of work done in a thermodynamic cycle.
In mechanics Noether’s theorem says the principle of energy to be equivalent to the natural laws of time invariance.
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