Question

when water is pour into an inverted funnel water falls from the side of the circular side of funnel but not vertically why?

Answer 1

cohesion force

Answer 2

I suspect this is because of the ionic nature of water. The water molecules are attracted to the sides of the funnel. A fascinating battery demonstrates this process (see the MIT physics lectures on youtube) where two streams of falling water generate electricity simply by falling through a hollow metal tin. Just before the pulse of electricity is discharged, the streams of water fluctuate towards the sides of the metal container.

Answer 3

This is both because water is held together by hydrogen bonding, and because the free energy of a boundary between water and the surface is lower than the free energy of water in a droplet form. Therefore the water will stick to the surface to remain in the lowest energy state, and the it will stick together because of the hydrogen bonding.