Surrounding the droplet. the droplet initially has a radius r. as the liquid water slowly evaporates, the droplet shrinks slowly with time, but the flux of the water vapor is at a nominal steady state. the temperature of the droplet and the surrounding still air are kept constant. the air contains water vapor of fixed concentration at an infinitely long distance from the droplet’s surface. after drawing a picture of the physical process, select a coordinate system that will best describe thi