Thermodynamics: Crash Course Physics #23
Have you ever heard of a Perpetual Motion Machine? More to the point, have you ever heard of why Perpetual Motion Machines are impossible? One of the reasons is because of the first law of...
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This little toy is called a Drinking Bird. You put a cup of water in front of it, and its head dunks into the cup. Eventually, the head bobs up again – but then it goes right back into the water. If you don’t know much about thermodynamics, the Drinking Bird might seem like it could go on forever, without an external source of energy powering it – a perpetual motion machine, in other words. But the toy isn't a perpetual motion machine – because perpetual motion is impossible, according to the laws of physics. One of the reasons is the first law of thermodynamics. [Theme Music] One of the main goals of thermodynamics is to describe the transfer of energy. We’ve already described two processes as a transfer of energy – work and heat – and they?...
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This little toy is called a Drinking Bird. You put a cup of water in front of it, and its head dunks into the cup. Eventually, the head bobs up again – but then it goes right back into the water. If you don’t know much about thermodynamics, the Drinking Bird might seem like it could go on forever, without an external source of energy powering it – a perpetual motion machine, in other words. But the toy isn't a perpetual motion machine – because perpetual motion is impossible, according to the laws of physics. One of the reasons is the first law of thermodynamics. [Theme Music] One of the main goals of thermodynamics is to describe the transfer of energy. We’ve already described two processes as a transfer of energy – work and heat – and they?...
