Question

With a 1°C change in temperature, the emf changes by ________ mV.

(a) 0.1

(b) 0.2

(c) 0.5

(d) 0.8

This question was addressed to me in examination.

This interesting question is from Spirometry in section Pulmonary Function Analysers of Biomedical Instrumentation

Answer 1

Right answer is (b) 0.2

The explanation: The factor –2.3036 RTF is called the slope factor and is clearly dependent upon the solution temperature. With a 1°C change in temperature, the emf changes by 0.2 mV. It is also obvious that the measurement of pH is essentially a measurement of millivolt signals by special methods.