Tsis yog txhua pob dej khov yog pov tseg; Nws nyob ntawm hom.
Cov khoom lag luam hauv dej khov hluav taws xob feem ntau yog tsim rau kev siv ib leeg nkaus xwb. Thaum siv, cov tshuaj sab hauv (xws li urele daws) nqus dej thiab yauv ua cov tshuaj tiv thaiv endothermic, txo qhov kub. Thaum cov tshuaj tiv thaiv no ua tiav, cov dej khov pob poob nws cov nyhuv txias thiab yog li ntawd cov khoom siv pov tseg. Txawm li cas los xij, hauv qee kis, nrog ceev faj kev siv, cov khoom siv dej khov uas siv tau ntau zaus, tab sis cov nyhuv txias yuav maj mam ploj zuj zus.
Lwm hom yog rusable mis ntim khoom khov. Cov no feem ntau yog ua los ntawm cov khoom siv xws li polymers thiab tuaj yeem siv rov qab los ntawm khov. Lawv feem ntau tsis tau ua - hauv kev siv hluav taws xob tab sis cia siab rau kom ua tiav qhov ua kom txias. Tsuav lawv tau khaws cia zoo thiab ua kom ntev thaum xav tau, cov khob dej khov tuaj yeem siv ntau zaus.
Yog li ntawd, seb ib pob dej khov puas yog pov tseg nyob ntawm nws hom tshwj xeeb. Thaum siv nws, thov xaiv cov hom dej khov uas tsim nyog raws li qhov xwm txheej tiag tiag thiab siv thiab khaws cia nws kom raug raws li cov lus qhia.
