Pressure is force spread over an area, P = F/A; in a fluid it also grows with depth, P = ρgh. Drag the sliders below to change the applied force, contact area and depth in water, and watch the two pressure gauges respond in real time.
This simulator carries two pressures that share a name but not a mechanism. The first is a push spread across a surface; the second is water bearing down as you sink into it. The Applied force and Contact area sliders feed the surface gauge, while the Depth in water slider drives a separate fluid gauge, so you can watch each one respond to its own inputs without the other budging.
Contact pressure follows P = F/A — force per unit area, never force alone. Hold the force steady and shrink the contact area, and the surface gauge climbs in inverse step: halve the area and the pressure doubles. Widen the area instead and the same push spreads thin, easing the reading. It is the difference between a snowshoe that keeps you atop the snow and a stiletto that punches straight through with identical weight.
Fluid pressure obeys P = ρ·g·h — the pressure the water itself adds — rising in a straight line with depth alone, so twice the depth means twice that added pressure, indifferent to how hard you press or how wide the container sits. A diver feels the squeeze grow with every metre down, on top of the atmosphere already pressing on the surface. Run both gauges together to keep the two ideas cleanly apart, then size a real scenario with the pressure calculator or open another hands-on model from the full simulation collection.
Pressure is force spread over an area: P = F/A, measured in pascals (newtons per square metre). The same force gives very different pressures depending on how large the contact area is.
For a fixed force, pressure is inversely proportional to area — halving the contact area doubles the pressure, while spreading the force over a larger area lowers it. That is why a sharp point pierces and a broad snowshoe does not sink.
The water's own (gauge) pressure rises linearly with depth, P = ρgh, so twice as deep gives twice that pressure (ρ is the fluid density, g is gravity). The total a diver feels also includes atmospheric pressure pushing on the surface, which sits on top of it.
No. Hydrostatic pressure depends only on the depth (together with the fluid density and gravity), not on the container's shape or how much water sits around — a point 10 m down is under the same water pressure in a narrow pipe or a wide lake.