Neglecting the surface tension effect, derive the expression for the maximum volume (and the minimum density as well) of the air droplet observed at the minimum channel cross-section. Assume air as an ideal gas, and the volume expansion process as isothermal ( = 250). (b) By considering the effect of surface tension , derive the expression for the maximum volume of the air droplet (do not try to solve the equation, it will be a nonlinear equation). Why this equation is a nonlinear one, comment? The pressure difference in/outside a droplet and the surface tension is related as = = 2 (see chapter-1 lecture)