如果风的阻力为零，它会发出声音吗?

戴夫:如果没有任何东西引起任何湍流，如果没有振动，它肯定不会产生任何声音，因为声音只是空气的振动。所以，如果风吹过某样东西，它就会产生振动，就像当风吹过物体表面的边缘时，会产生一些漩涡，就会产生一些湍流或者湍流可以驱动瓶子或其他东西的振动当你吹过瓶子的顶部时，会产生非常大的声音。如果你在一个气柱的中间，如果你在高空，所有的空气都朝着同一个方向快速移动，没有相对运动，所以你不会得到任何振动。那里会很安静。所以人们乘坐热气球是非常非常安静的，即使风很大，因为他们是随着风移动的。然而，对于他所说的抵抗有不同的解释。其中之一是液体有多粘稠。所以这是流体本身的内阻，而不是它与壁的相互作用。这是流体内部的阻力。戴夫:没错。 Basically, how much friction there is inside the fluid itself and fluids which are very, very viscous, things like treacle will move very, very smoothly, and you won't get any vibrations and it'll essentially be very, very quiet. However, if there's very, very low viscosity, it can't lose energy by viscous flow by friction. It can only lose it by turbulence. airflows being incredibly turbulent and very, very noisy. Ben - So that goes back to what Fred was saying about how you have to put energy in to create turbulence and then it actually loses the energy back to this internal friction. Dave - That's right and the more viscosity there is, the quicker the turbulence will die away, and if there's enough it won't form in the first place.