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A particular gas thermometer is constructed of two gas containing bulbs, each of which is put into a water bath, as shown Fig. 21- 17. The pressure difference between the two bulbs is measured by a mercury manometer as shown in the figure. Appropriate reservoirs, no shown in the diagram, maintain constant gas volume in the two bulbs. There is no difference in pressure when both baths are at triple point of water. The pressure difference is 120 mm Hg when one bath is at the triple point and the other is at the boiling point of water. Finally, the pressure difference is 90.0 mm Hg when one bath is at the triple point and the other is at an unknown temperature to be measured. Find the unknown temperature.

A particular gas thermometer is constructed of two gas containing bulbs, each of which is put into a water bath, as shown Fig. 21- 17. The pressure difference between the two bulbs is measured by a mercury manometer as shown in the figure. Appropriate reservoirs, no shown in the diagram, maintain constant gas volume in the two bulbs. There is no difference in pressure when both baths are at triple point of water. The pressure difference is 120 mm Hg when one bath is at the triple point and the other is at the boiling point of water. Finally, the pressure difference is 90.0 mm Hg when one bath is at the triple point and the other is at an unknown temperature to be measured. Find the unknown temperature.               

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