1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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|Zeroth Law||First Law||Second Law||Third Law|
|When each of two systems is in equilibrium with a third, the first two systems must be in equilibrium with each other. This shared property of equilibrium is the temperature. The concept of temperature is based on this Zeroth Law.||Because energy cannot be created or destroyed (with the special exception of nuclear reactions) the amount of heat transferred into a system plus the amount of work done on the system must result in a corresponding increase of internal energy in the system. Heat and work are mechanisms by which systems exchange energy with one another. This First Law of thermodynamics identifies caloric, or heat, as a form of energy.||Entropy—that is, the disorder—of an isolated system can never decrease. Therefore, when an isolated system achieves a configuration of maximum entropy, it can no longer undergo change (it has reached equilibrium). Additionally, it is not enough to conserve energy and thus obey the First Law. A machine that would deliver work while violating the second law is called a "perpetual-motion machine of the second kind." In such a system, energy could then be continually drawn from a cold environment to do work in a hot environment at no cost.||The Third Law of thermodynamics states that absolute zero cannot be attained by any procedure in a finite number of steps. Absolute zero can be approached arbitrarily closely, but it can never be reached.|