When you dip a fork into a plate of hot food right off the stove and pull it out again with a forkful of food, it generates water vapour steam from the temperature difference. I am wondering how the shape of this steam is formed in the absence of external forces like wind; is it governed by the Navier-Stokes equations, and if so, how? Does the shape change is the steam is of a material other than water?
This phenomenon is described in this video: https://youtu.be/fAQLlG-elTI
I hope I described the question well, but I am happy to clarify anything if it is not. I am just curious to know how steam forms the wonderful shapes/formations that it does. Thank you!