# Does gravity change the pressure of a column of water when the column is tilted from horizontal to vertical?

I need to settle an argument. I think gravity causes a column of water to exert greater pressure against the walls of a pipe in which it is contained as it is tilted from horizontal to vertical. In other words, the pressure in supply pipes from a remote elevated water source would be increased at the destination from what it was at the source depending upon the length of the pipe and the degree of incline. Right or wrong?

• Are you sure about that? P = $P_{o}$ + $\rho \ g \ h$, where $P_{o}$ is some external pressure, $\rho$ = mass density of fluid (water here), $g$ = acceleration of gravity, and $h$ relative height. Unless the column is more than 1 km or so, $P_{o}$ will be roughly constant but $\rho \ g \ h$ will change significantly at the bottom of the column but not at the top. Oct 25 '14 at 15:50