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Q. 11.5  Two ideal gas thermometers A and B use oxygen and hydrogen respectively. The following observations are made :                

                     Temperature                     Pressure                                              Pressure

                                                           thermometer A                                   thermometer B

                Triple-point of water           1.250\times 10^{5}Pa                              0.200\times 10^{5}Pa

                 Normal melting point        1.797\times 10^{5}Pa                               0.287\times 10^{5}Pa

                    of sulphur

(b) What do you think is the reason behind the slight difference in answers of thermometers A and B? (The thermometers are not faulty). What further procedure is needed in the experiment to reduce the discrepancy between the two readings?

                

Answers (1)

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The slight difference in answers of thermometers A and B occur because the gases used in the thermometers are not ideal gases. To reduce this discrepancy the experiments should be carried out at low pressures where the behaviour of real gases tend close to that of ideal gases.

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