Isifudumezi sikagesi esingaqhumi siwuhlobo lokudla amandla kagesi aguqulwa abe amandla okushisa ukushisisa izinto ezizoshiswa.Ngesikhathi somsebenzi, uketshezi olunezinga lokushisa eliphansi lungena embotsheni yokufaka ngaphansi kwengcindezi ngepayipi, futhi lususe amandla okushisa aphezulu akhiqizwa into yokushisisa kagesi eduze kwesiteshi esithile sokushintsha ukushisa ngaphakathi komkhumbi wokushisisa kagesi, kusetshenziswa indlela eklanyelwe. ngesimiso se-fluid thermodynamics.