是動量擴散率(黏度)及磁擴散率的比例,定義為: P r m = R e m R e = ν η = viscous diffusion rate magneticdiffusion rate {\displaystyle \mathrm {Pr} _{\mathrm {m} }={\frac {\mathrm
電漿的磁拓撲可以通過磁擴散(英语:Magneticdiffusion)和重聯來改變。然而,在大磁雷諾數的極限下,磁場的擴散和重聯不可能發生,因而磁拓撲結構得以保留。 Longcope, Dana W. Topological Methods for the Analysis of Solar Magnetic Fields
Cherepanov, H. Wipf. Hydrogen in the A15 compound V3Ga: 51V and 1H nuclear magnetic resonance study. Journal of Alloys and Compounds. 1994-07, 209 (1-2): 111–116