First slide

Thermometry

Question

A centrigrade and a Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 176⁰F. What is the fall in temperature as registered by the Centigrade thermometer

Easy

A

20⁰C
B

40⁰C
C

60⁰C
D

80⁰C

Solution

$\begin{array}{l} \frac{176 - 32}{180} = \frac{C}{100} \\ C = \frac{(176 - 32)}{1 .8} = 80^{\circ} \end{array}$
Fall = 100 – 80 = 20°

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