Kab laj thawj kev sib twb kev sib twb yog qhov khoom uas siv los nrhiav paub tias lub zis yog ntau lossis tsawg. Raws li no, nws siv los twb kev sib twb. Kev sib twb yog qhov tseem ceeb vim nws txhais qhov yuav ua li cas ntawm lub zis thaum nws mob. Piv txwv li, honey (ntawv nyuj) muaj kev sib twb siab heev (nws mob tsaus), thiab dej muaj kev sib twb tsawg heev thiab nws mob tsaus dua. Lwm cov kev lag luam ntau yam, piv txwv li kev lag luam noj, kev lag luam tshuaj, thiab kev lag luam tshuaj ntsuab, kuj yuav tsum twb kev sib twb ntawm lawv cov khoom los daws paub tias lawv yuav ua haujlwm zoo. ZONWON yog qhov tseem ceeb ntawm kev tsim Viscometers , uas yog cov khoom tseem ceeb rau cov neeg siv khoob thiab cov neeg ua haujlwm hauv lwm cov kev lag luam los nrhiav kev ua haujlwm zoo.