Question

What pressure difference must be generated across the length of a 15cm vertical drinking straw in order to drink a water-like liquid of density 1 gram per cubic centimeter?

Answer 1

Pressure difference required = pressure at the due to vertical column of liquid

Pressure difference $=h\rho g$

$h=0.15\ m\\\rho=1\ g\ cm^{-3}=1000\ kg\ m^{-3}\\g=9.8\ m\ sec^{-2}$

Pressure required = $0.12\times 1000\times 9.8=1176\ Pascals$