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Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury. | |
A. | 250 [Wrong Answer] |
B. | 350 [Wrong Answer] |
C. | 550 [Correct Answer] |
D. | 700 [Wrong Answer] |