A mercury-in-glass thermometer reads -20º at the ice point and 100º at the steam point. Calculate the Celsius temperature corresponding to 70º on the thermometer.
100º → 100
70º → x
-20º → 0
Using the interpolation method
\(\frac{70 -(-20)}{100 -(-20)}\) = \(\frac{x - 0}{100 - 0}\)
\(\frac{90}{120} = \frac{x}{100}\)
120x = 90 x 100 = 9000
x = \(\frac{9000}{120}\) = 75.0ºC
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