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If these two pressures are different, the water will be forced to move. And as the graph shows, water at 82 o C is about 1% less dense than the same water at 65 o C. This may not sound very much, but it's enough. The difference in the density of the water in the flow and return pipes is about 10 kg/m 3.
Water pressure is the amount of force from the water main into your home. Water pressure is measured in pounds per square inch (PSI), and normal water pressure is typically between 30 and 80 PSI. Functional flow is the volume of water flowing through your pipes and arriving at individual fixtures.his water pressure gauge shows slightly high pressure of 85 PSI. What they actually want to know is whether the flow from the showerhead will be strong enough for a quality shower, and whether someone flushing a toilet will interrupt that shower.