A thermometer is initially at a temperature of 70.f and is suddenly placed in a liquid which is maintained at 300.f. the thermometer indicates 200 and 270.f after time intervals of 3 and 5 s, respectively. estimate the time constant for the thermometer
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Write the governing equation for the thermometer.
 ...... (1)
Here, surrounding temperature is  , steady state temperature is  , initial temperature is, time is t, and average time constant for the thermometer is  .
Calculate the average time constant for the thermometer  .
 ...... (2)
Here, time constant at  is  and time constant at  is  .
 ...... (1)
Here, surrounding temperature is  , steady state temperature is  , initial temperature is, time is t, and average time constant for the thermometer is  .
Calculate the average time constant for the thermometer  .
 ...... (2)
Here, time constant at  is  and time constant at  is  .
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