1. The problem statement, all variables and given/known data A stream of water flows vertically downward at a speed of v1 = 2.0 m/s from a faucet of cross sectional area A = 0.5 cm^2 to the bottom of a sink a distance h = 20 cm below. 2. Relevant equations Bernoulli's P(atm) + (rho)gh = P(atm) + 0.5(rho)v^2 3. The attempt at a solution solution v = 2.81 m/s I understand how to get the velocity at the bottom, but I was just wondering why atmospheric pressure acts on both the top and the bottom. I can grasp how atmospheric pressure acts on the bottom of the stream, but how does it act on the top of the stream?