剛剛我問人的答案....(這個人17歲做大3物理)
餓漢傑克 說:
why the cloud ring forms when plane accelerates to exceed the speed of sound?
Lucas 說:
when the plane breaks the sounds barrier the peaks of the sounds waves superimpose (add up) which creates an increase in pressure (sound is just a pressure wave) when the pressure drops back to normal the water in the air condeses into fog at the point where the plane broke the sound barrier