Energy is not only about quantity. Also the quality of energy matters. This is expressed through the concept of exergy, which is mainly based on thermodynamics.
Exergy is commonly used in scientific meetings, but still quite unknown outside these meetings. And apparently not so easy to explain. Last week at a conference on sustainable building during a presentation on exergy, someone from the public asked what exergy stands for. Two persons started trying to explain it, but at the end, nobody could follow.
Therefore this minute lecture 'There's more about energy than joules' : a short, funny, visual and very clear explanation of the meaning of exergy.
Much more useful information about all aspects of energy can be found on the website of Leonardo Energy, the global community for sustainable energy professionals.
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