Approximately how deep under the surface of a lake with the pressure double that at the surface?

Question

Take the atmospheric pressure at sea level for the pressure at the lake surface and the density of water is 1000 kg/m³.

1m

10m

100m

1000m

Answer 1

The pressure at a depth (P_h) equals the pressure at the surface (P_sur) plus, the density of the fluid (ρ) times the acceleration of gravity (g) times the depth below the surface (h).

P_h = P_sur + ρgh

In this case, you want the pressure at depth h to be twice the pressure at the surface,