1–32E

1–32E The temperature of a system drops by 45°F during a
cooling process. Express this drop in temperature in K, R,
and °C.
ANS
1-32EA temperature change isgiven in °F. Itistobe expressed in °C, K, andR.
Analysis Thisproblemdeals withtemperature changes, which are identicalin Rankine and Fahrenheit
scales. Thus,
∆T(R) = ∆T(°F) = 45R
The temperature changes in Celsius and Kelvin scales are also identical, and are related to the changes in
Fahrenheitand Rankine scales by
∆T(K) = ∆T(R)/1.8 = 45/1.8 = 25 K
and  ∆T(°C) = ∆T(K) = 25°C