hydrostaticadjective
/ˌhaɪ.drəʊˈstæt.ɪk//ˌhaɪ.droʊˈstæt̬.ɪk/specializedrelating to fluids (= liquids or gases) that are not in motion:
Hydrostatic pressure pushes water through the rock.
In a hydrostatic test, the pipes are filled with water and put under pressure to check for leaks.