Question

why do we see water droplets on the surface of a glass containing ice- cold water ?

Answer 1

we see droplets on the outer surface of a glass containing ice - cold water . because of the high magnitude of law temperature of the glass,it's surrounding become cooler then it was before . Due to which , the moisture in the air around the outer surface of the glass condensates, settles down and hence turns into liquid from( water droplets)

Answer 2

because the vapours present in the air when come in lower temperature of glass surface containing ice - cold water

the water vapours get converted from gaseous to liquid form in the presence of low temperature

that is the main reason why we see water droplets on the surface of a glass containing ice - cold water