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The Most Misunderstood Concept in Physics
About this video
Veritasium's explainer on entropy, presented as one of physics' most important and least understood concepts. It uses examples such as heat engines and the sun's energy flowing through the Earth.
Why it appears in the archive
HN commenters say it made entropy intuition click and point to it in threads on energy, heat and equilibrium.
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From the Hacker News discussion
For the longest time I had no real intuition of what entropy actually represented. This veritasium video explained it in a way that finally clicked for me: [VIDEO]
Read original comment ↗Maybe watch this video about entropy. Its not about where energy flows, its about hoe entropy can be used to calculate. [VIDEO]
Read original comment ↗It's not temperature = constant * (energy from sun - energy reflected - energy radiated) Temperature is precisely what leads to 'energy radiated' after all (see: black body emission). Temperature is not 'the leftover energy'. The Earth is broadly in equilibrium. It's more like delta_temperature = constant * (energy from sun - energy reflected - energy radiated) Any imbalance between energy in and energy out is what manifests as increase or decrease in global temperature. This Veritasium video gives a good idea of what we do get from the sun, if not 'net energy in': [VIDEO]
Read original comment ↗This is a great video that touches on your point, the Earth must radiate the heat it receives to stay in equilibrium, even if it uses it to do work in the process. [VIDEO]
Read original comment ↗I like my entropy story with more steam engines, “The most misunderstood concept in physics", by Veritasium (YouTube, 2023) ( [VIDEO] )
Read original comment ↗