So, if a vector field satisfies <math>\nabla \times \vec{F}=\vec{0}</math>, it means it's not spinning around any axis, anywhere. It makes sense to call such a field '''irrotational'''. | So, if a vector field satisfies <math>\nabla \times \vec{F}=\vec{0}</math>, it means it's not spinning around any axis, anywhere. It makes sense to call such a field '''irrotational'''. |