Hello guys, I'm reading about fluid mechanics and learning how fluid behaves when there is a pressure and temperature change. I found this: „Liquids are deemed incompressible and therefore, density and the volumetric flow rate do not change“, and this: „Temperature affects liquids and gases in the same way. Both liquids and gases expand with rising temperature and the volumetric flow rate will therefore increase. A decrease in temperature will have an opposite effect.“ I wonder what is order of mangitude of volumetric flow? For example, if I have pipeline which is used to transport hot water for purpose of warming some object and pressure and temperature on transmitting end are: p = 15 bar, T = 90 deg Celz, and on it's return (for purpose of heating again) parameters are p = 1 bar and T = 50 deg Celz, what is order of change if on sending end flow was 200 m^3/h (kubic meters per hour)? Is this temperature change likely to cause decrease in flow on it's return end (return pipe) more than, say, 1 m^3/h if all other leaks and losses are negligible? I need to know this in order to estimate losses in pipeline because I have two measurement places (one place where hot water is sent through pipeline, and on it's return end) and differece is about 15 m^3/h. Temperature differece is about 40 deegrees Cel., I doubt that difference in flow is greater of 1 m^3/h due to temperature change.