Ad: It Takes A Lot Of Work To Exist Thermodynamics Doormat
No need to be a physics major or physicist to enjoy this doormat featuring the Carnot heat engine along with the wry truism saying "It Takes A Lot Of Work To Exist 24 Hours A Day 7 Days Per Week 365 Days Per Year". This design features the second law of thermodynamics. Since any thermodynamic engine requires such a temperature difference it follows that useful work cannot be derived from an isolated system in equilibrium; there must always be an external energy source and a cold sink. Educational physics attitude door mat for anyone who works in the thermodynamic sense of the word! myPhysics
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