Masu amfani da yawa sun yi watsi da wannan, suna tunanin bambancin zafin jiki ba shi da mahimmanci, gwajinmu ya tabbatar da cewa lokacin da zafin jiki ya bambanta 0.5 ℃, wasu darajar viscosity na ruwa ya bambanta fiye da 5%, bambancin zafin jiki ya yi tasiri sosai a kan viscosity, zafin jiki ya tashi, viscosity ya ragu. Saboda haka, kula musamman don daidaita zafin jiki na ruwan da aka auna a kusa da yanayin zafin jiki da aka ƙayyade, don daidai ma'auni kada ya wuce 0.1 ° C.