Cov lus txhais ntawm convection
Cov txheej txheem los ntawm cov kua dej (roj lossis kua) hloov kub los ntawm cov macroscopic khiav ntawm nws qhov chaw. Vim tias cov thermal conductivity ntawm cov kua hluav taws xob yog me me, cov cua sov hloov mus los ntawm kev ua kom sov yog qhov me me, thiab convection yog qhov tseem ceeb kub hloov txoj kev ntawm cov kua dej. Convection yuav tau muab faib ua lub ntuj convection thiab yuam convection. Qhov ntsuas kub ntawm qhov ntsuas kub hauv qhov dej ua kua yuav ua rau muaj ib qho ntaws gradient. Yog tias lub qes-dej ntws tawm qis thiab lub nruab nrog-siab npliag, nws yuav ib txwm yoog raws cov qauv ntawm lub ntiajteb txawj nqus. Cov cua kub hauv tsev hauv lub caij ntuj no yog ua raws li kev ua kom tau zoo ntawm huab cua sab hauv kom hloov tau cua sov. Ntuj tsim teb kuj muaj nyob rau hauv huab cua thiab dej hiav txwv. Sab nraud quab yuam ua rau cov kua hauv plawv mus ntev, yog li hloov mus tshav kub yog yuam kom convection.