Pascal's law (source code)

= Pascal's law
{c}
{title2=$\Delta p_1=\Delta p_2$}
{wiki}

A <pressure> increment applied to a confined <fluid> in equilibrium is transmitted throughout it. The pressure increment is a <scalar>, not a <force> vector copied in one direction. Comparing different heights also requires the <hydrostatic pressure> difference. Finite-speed <pressure wave propagation> precedes the new equilibrium.