Hydraulic xovxwm yog ib daim ntawv thov tseem ceeb ntawm hydraulic lub hauv paus ntsiab lus, uas muaj peev xwm tsim ultra-siab siab ntawm ntau tshaj 100Mpa thiab ntau pua tons ntawm siab. Lub tshuab hydraulic siv Pascal txoj cai hauv cov kua dej statics, siv cov roj los yog lwm yam kua los hloov siab hauv cov kua, thiaj li ua kom muaj zog me me los tswj lub siab loj, uas yog me ntsis zoo ib yam li lub hauv paus ntsiab lus ntawm qib. Lub compressibility ntawm cov kua yog feem ntau me me, yog li nyob rau hauv cov kua statics, kua yog suav tias yog incompressible; nyob rau hauv ib qho incompressible static kua, cov nyhuv ntawm sab nraud quab yuam ntawm ib qho taw tes yuav raug xa mus rau tag nrho cov ntsiab lus ntawm cov kua, uas yog Pascal txoj cai.
Yog vim li cas cov xovxwm hydraulic tuaj yeem tsim muaj zog zoo li no yog vim nws siv qhov zoo ntawm cov khoom sib kis ntawm cov kua hauv cov yeeb nkab kaw. Thaum cov kua raug quab yuam hauv cov yeeb nkab, nws tuaj yeem hloov lub zog no mus rau lwm qhov. Cov xovxwm hydraulic siv lub hauv paus ntsiab lus no los ua kom lub zog tawm tswv yim thiab hloov mus rau hauv lub zog tso zis ntau dua. Cov kua hauv hydraulic xovxwm feem ntau yog cov kua dej siab, siab-siab, qis-compressibility kua. Thaum cov kua dhau los ntawm lub tog raj kheej hydraulic, nws yuav raug compressed, uas yuav ua rau muaj kev kub ntxhov. Qhov kev kub siab no tuaj yeem hloov pauv mus rau hauv lub zog kom tsim tau lub cev txav mus los.
