This Demonstration depicts the flow from a tank where the liquid is maintained at a constant height. It shows that the liquid's flow rate is proportional to the square root of its height. The program calculates the volumetric flow rate,

, using a slightly modified Bernoulli equation

, where

is the gravitational constant (9.81

),

is the liquid's height in the tank (m),

is the discharge (orifice) coefficient (dimensionless), and

the drain diameter (cm). The corresponding mass flow rate (kg/s) is calculated by multiplying the volumetric flow rate,

, by the liquid's density,

(

).

V. L. Streeter, E. B. Wylie, and K. W. Bedford,

*Fluid Mechanics*, 9th ed., Boston: WCB/McGraw-Hill, 1998.