Question

Accurate Celsius thermometer and a Fahrenheit thermometer register ${60}^o$ and ${141}^o$ respectively when placed in the same constant temperature enclosure. What is the error in the Fahrenheit thermometer?

• A. $1^{o}F$
• B. $3^{o}F$
• C. ${-5}^{o}F$
• D. $2^{o}F$

Answer 1

The correct option is A $1^{o}F$

Conversion of Celsius thermometer reading into Fahrenheit:

$\frac{C}{100}=\frac{F-32}{180}$

$F=\frac{9C}{5}+32$

$F=\frac{9\times 60}{5}+32$

$F=140℉$

Reading of Fahrenheit thermometer:

$F^{\prime }=141℉$

Error in the measurement of Fahrenheit thermometer:

$\Delta F=1℉$