Cov pas nrig sib nqus, ua cov cuab yeej lossis cov khoom siv uas siv cov qauv sib nqus, muaj kev siv dav hauv kev lag luam niaj hnub, tshuaj, kev ua zaub mov, thiab lub neej txhua hnub. Lawv lub luag haujlwm tseem ceeb nyob hauv kev tsim cov teb sib nqus los ntawm kev tsim- hauv cov khoom sib nqus, yog li ua kom cov adsorption, kev sib cais, lossis qhov chaw ntawm cov tshuaj ferromagnetic.