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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.
Imagine the electrical circuit as water channels, containers and such. In order for the water to flow in those channels, you need to raise to water high enough or provide enouâ¦gh water pressure to go through thick and thin pipes and fill in the containers. Electrical Energy or similarly the Voltage does the same thing. It provides enough pressure to the electrons to make them flow in the circuits. Then different circuits can do different things on the flow. Electricity can also hurt people, as you may very well know. So be careful!