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Physics 13 Online
OpenStudy (anonymous):

can someone explain to me about first and second law of thermodynamics?

OpenStudy (anonymous):

First law is conservation of energy. Second is that entropy does not decrease, usually increases. Systems go from ordered to disordered.

OpenStudy (anonymous):

hm...thats quite handy..thank..

OpenStudy (anonymous):

I'd like to clarify that the second law applies to isolated systems. An isolated system is a system where no energy (of any king; heat, work, etc.) or mass is able to enter or leave the system. In an isolate system, entropy always increases. For a non-isolated system, we can increase entropy. Take your freezer for example. If we do EXTERNAL work to the system and remove heat from the freezer box, we increase the entropy of the water in the ice tray and turn it into ice. The second law is probably the hardest to grasp in any concrete terms. It's hard to express in an analogous manner.

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