Hydrostatic Columns

Pressure Difference Depends on Depth Change

Changing only the depth changes the hydrostatic pressure difference. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

Pressure difference follows depth change

Depth 1 metre gives 20 pascals; depth 3 metres gives 60 pascals.

60minus⁡20=4060\operatorname{minus}20=40
Shallow depth ledgerThis step shows the shallow checked value.rho=2 kg/m^3g=10 m/s^2h=1 mdP=20 Pa

The pressure change is exact

The deeper label exceeds the shallow label by 40 pascals.

Δ(ΔP)=40 Pa\Delta(\Delta P)=40\ \mathrm{Pa}
Deep depth ledgerThis step shows the deeper checked value.rho=2 kg/m^3g=10 m/s^2h=3 mdP=60 Pa