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Comment: Re:If you believe in zero viscosity (Score 4, Interesting) 213 213

Perpetual motion is actually a fundamental property of the universe, though we usually call it inertia: a body will not stop moving, unless somebody moves it. Therefore, linear perpetual motion is the norm, with change of velocity depending on an outside force.
To make it even more interesting: non-linear perpetual motion is actually also present in all molecules, at any given temperature, even at 0 Kelvin. Quantum chemistry shows that vibrational motion in a molecule changes by energetic quanta, where at least half a quantum is always present in a vibrational degree of motion (so-called zero-point energy). Hence, the atoms in a molecule are always in motion, even at 0 K, and the motion is non-linear. In first approximation, especially for diatomic molecules, it can be described as an oscillation with a parabolic energy profile, for multi-dimentional molecules one usually gets ergodic movement that is a bit more complex to describe, and is usually considered chaotic where only the statistical properties are relevant.
But no free energy, of course.

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