Abstract
The problem of calculating the mass flow rate of the flow of steady-state viscous liquid from a small vessel into a vertical tube is considered. Definite calculations of a complex tube with a moving liquid are given. The velocity of the liquid movement, the pressure change are calculated, the laminar property of the liquid movement in this case is confirmed.11This research was funded by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant No. AP14871641).