Hot water for domestic use : a complete guide to the methods of supplying and heating water for domestic purposes, giving each step to be taken and explaining why it is done . principle of circulation in circuit A Simple Experiment 15 is shown in Fig. 2. If a U-shaped tube be filledwith water up to the top of the dotted line a, thewater will stand in both legs of the loop at ex-actly the same height. This is due to the factthat the water in boththe legs, being of thesame temperature anddensity, will exactly bal-ance each other and re-main so in obedience tothe law that water at restwill find i
Hot water for domestic use : a complete guide to the methods of supplying and heating water for domestic purposes, giving each step to be taken and explaining why it is done . principle of circulation in circuit A Simple Experiment 15 is shown in Fig. 2. If a U-shaped tube be filledwith water up to the top of the dotted line a, thewater will stand in both legs of the loop at ex-actly the same height. This is due to the factthat the water in boththe legs, being of thesame temperature anddensity, will exactly bal-ance each other and re-main so in obedience tothe law that water at restwill find its own level. If,on the other hand, thetube be connected nearthe top by the cross-tubeshown by dotted lines,the water would finds itslevel at the highest pointto which it could raise,and would remain sta-tionary at that point, andso long as the temperature of the water at all pointsremained unchanged, there would be no perceptiblemovement of the water within the tube. Should,however, a U-shaped tube, such as shown in theillustration, be filled w^ith water up to the line a,and there be no cross-tube connecting the tops ofthe two legs, and further, should heat be applied. Fig. 2. 16 Hot Water for Domestic Use to one of the legs, as at b, the water in that legwould become warmer, increase in bulk, and wouldrise above the level of the line a. It would simplybe a case of two columns of liquid of different den-sities, and a greater column of the lighter liquidwould be required to balance the heavier liquid. That portion of the lighter liquid which risesabove the line of the heavier liquid, if it had nobounds to confine it, it could flow in any direction;so that if a tube, represented by the dotted lines,were to join the two legs of the U-shaped tube, theexcess water in the hot water side would flow tothe cold water side of the loop. This transfer ofwater from the hot water to the cold water sideof the loop would upset the balance of the two col-umns of water and water would flow from
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