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Entropy and Second Law of Thermodynamics
| Content Provider | AK Lectures |
|---|---|
| Description | The general statement for the Second Law of Thermodynamics involves a concept known as entropy. Entropy is essentially a measure of the disorder of a system and is defined (if the temperature during a process is constant) as the heat flow into a system per unit temperature (given in Kelvins). For a process with a non-constant temperature, the infinitesimal change in entropy is equal to the ratio of the infinitesimal change in heat to the temperature (given in Kelvins). Entropy is a state variable, which basically means that the change in entropy between any two states never depends on the pathway taken to get from state one to state two but rather only depends on the conditions of those two states. We can define the Second Law of Thermodynamics in the following way: the total change in entropy of any system plus its surroundings increases during any natural or real process. For a reversible process, the change in entropy of the isolated system is equal to zero. Of course, reversible processes do not actually exist and so the entropy change always increases. |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Classical Physics heat disorder entropy measure concept statement pathway way states ratio |
| Content Type | Video |
| Educational Role | Teacher Student |
| Educational Use | Self Learning Lecture Reading |
| Resource Type | Video Lecture |
| Education Level | Under Graduate |
| Subject | Heat |
