Question

Why does water flowing out of faucet narrower as it goes down?

Answer 1

In the case of the tap, the water flow binds together because of surface tension forces. But when the flow becomes to thin, an instability occurs as you can see it loses its circular shape. and the stream becomes thinner as the water flows down.

Answer 2

In the case of the tap, the water flow binds together because of surface tension forces. But when the flow becomes to thin, an instability occurs as you can see it loses its circular shape. and the stream becomes thinner as the water flows down.