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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Even better... why tying a Reef Knot in a Venetian Blinds cord improves the sound?

Posted by Chip647 on February 5, 2013 at 08:20:28:
Entropy:
Where the temperature of a closed system is divided into an incremental reversible transfer of heat energy into that system. Entropy is, remarkably, a function of state. That is to say, for example, that a substance at a particular temperature and pressure (and thus a particular state) is at not only a particular volume but also at a particular entropy. Entropy is an extensive property, but it is often given as an intensive property of specific entropy as entropy per unit mass or entropy per mole. Unlike many other functions of state, entropy cannot be directly observed but must be calculated. Entropy can be calculated for a substance as the standard molar entropy from absolute zero (also known as absolute entropy) or as a difference in entropy from some other reference state which is defined as zero entropy. Entropy has the dimension of energy divided by temperature, which has a unit of joules per kelvin in the International System of Units. While these are the same units as heat capacity, the two concepts are distinct.