Source: wikibot/kelvin-s-circulation-theorem
= Kelvin's circulation theorem
{wiki=Kelvin's_circulation_theorem}
Kelvin's circulation theorem is a fundamental principle in fluid dynamics, particularly in the study of inviscid (non-viscous) and irrotational flows. It states that the circulation around a closed contour moving with the fluid is constant in time, provided the flow is conservative and the fluid is incompressible and inviscid.