Pob Lo Lus Txhais
Thaum tsis muaj lub npuas lossis tsis huv nyob hauv cov kua, txawm tias qhov ntsuas kub tau nce thiab dhau qhov taw tes npau npau, nws yuav tsis rhaub, tsim cov kua superheated. Cov kua superheated tsis ruaj khov. Yog hais tias qhov kub ntawm ib puag ncig sab nraud ntawm cov kua superheated dheev poob qis lossis nkag rau npuas lossis impurities, nws yuav tsim cov dej npau npau, nrog lub suab nrov.