Since the dawn of civilization, at the epoch “fire” was discovered, science minded people begin to find ways to measure the “hotness” of “fire.” Along this endeavor, blacksmiths found that blue flame is very much hotter than red flame and a sword forged by blue flame became the toughest of many bladed weapons. The real reason only became known in 1900 during the beginning of the quantum revolution heralded by the molecular kinetic theory of heat. Before 1900 heat was hypothesized as a fluid that flows by conduction from one substance to another. Each fluid is calibrated using various scales of temperature. For the Fahrenheit scale at standard pressure of 1 atmosphere water boils at 212°F and freezes at 32°F. The healthy human body has a normal temperature of 98.6°F. Thereafter scientists begin to realize that adding temperature is physically impossible. For example, two healthy humans locked together never boil away as the combined temperature reaching 212°F. On the other hand, a large group of Emperor Penguins locking bodies together has survived subzero temperatures in the Antarctic for thousands of years.
The impossibility of adding temperature is a dilemma that succeeding scientists overcome by defining two more thermodynamics concepts: the enthalpy and the specific heat. There are many applied definitions of enthalpy and specific heat. As a form of energy, enthalpy has the same units, while the specific heat is a multiplicative constant specific for each substance with units of energy per unit mass and unit degree of temperature. If the specific heat is known for a given substance then its product with its temperature gives the amount of energy stored in the substance. Enthalpy can be added as well as subtracted. Extending this idea to the quantum vacuum fluctuations, since the cosmic background radiation has temperature of a few degrees kelvins, if the specific heat of the quantum vacuum can be determined then their product gives the stored energy of the vacuum, suggesting that the enthalpy of the vacuum is extractable!


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