The deeper the water, the more weight sits above — and the stronger the push against anything at that depth. Punch four holes at different heights in a milk carton, tape them shut, fill it with water, and remove the tape from all holes at once. The lowest stream shoots the farthest because more water weight presses down on it. The streams higher up travel a shorter distance, where less weight sits above the hole. That same principle drives hydroelectric dams, which funnel high-pressure water from the bottom of a reservoir through a turbine to generate electricity.