Since it is known that the pouring time (T) of the sand in an hourglass depends on the height of the sand before it is poured (H), the density of the sand (ρ), the hole diameter (d) and the...

Since it is known that the pouring time (T) of the sand in an hourglass depends on the height of the sand before it is poured (H), the density of the sand (ρ), the hole diameter (d) and the gravitational acceleration (g), obtain the phenomenon with the Buckingham pi theorem.