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Tag Archive for: second law

perpetual motion machines

Why We Don’t Discuss Perpetual Motion Machines (PMM)

January 30, 2020
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12 Comments
Authorship Authorship Contributions From Anorlunda Introduction You may want to believe the article you read, or the video you saw, or you may be very…
https://www.physicsforums.com/insights/wp-content/uploads/2020/01/perpetual_motion_machines.png 135 240 russ_watters https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png russ_watters2020-01-30 07:15:512026-02-17 07:17:56Why We Don’t Discuss Perpetual Motion Machines (PMM)
entropy

How to Determine the Change in Entropy

August 22, 2016
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9 Comments
How do you determine the change in entropy for a closed system that is subjected to an irreversible process?Here are some typical questions we get…
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earlyuniverse

Why Wasn’t the Early Universe at Maximum Entropy?

December 29, 2015
No. The second law of thermodynamics states that entropy can only increase over time. If the early universe had begun in a state of maximum entropy, the…
https://www.physicsforums.com/insights/wp-content/uploads/2015/12/earlyuniverse.png 135 240 bcrowell https://www.physicsforums.com/insights/wp-content/uploads/2019/02/Physics_Forums_Insights_logo.png bcrowell2015-12-29 23:45:482026-07-31 12:59:18Why Wasn’t the Early Universe at Maximum Entropy?
Thermodynamics

Understanding the Second Law of Thermodynamics Clearly

April 30, 2015
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73 Comments
Introduction The second law of thermodynamics and the associated concept of entropy have been sources of confusion for thermodynamics students for centuries.…
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