Temperature Conversions

Upon studying this section, you should be familiar with the following:

Explanation:

In this page, I just want to remind you that there is a difference between converting a specific temperature and converting a change in temperature (we will do this using the following example) as well as provide you with all the temperature conversion formulas you will need in chemical engineering.
Here are the conversion formulas:


Converting Temperature
InterrelationFormula
Celsius & FahrenheitT(F) = 1.8 * T(C) + 32
Kelvin & CelsiusT(K) = T(C) + 273.15
Kelvin & RankineT(R) = 1.8 * T(K)
Rankine & FahrenheitT(R) = T(F) + 459.67



Converting Temperature Changes
InterrelationFormula
Celsius & Fahrenheit ΔT(F) = 1.8 * ΔT(C)
Kelvin & Celsius ΔT(K) = ΔT(C)
Kelvin & Rankine ΔT(K) = 1.8 * ΔT(R)


Converting a temperature at 10C and a change in 10C to F, as we now know, are not one in the same. The first corresponds to 50F and the second corresponds to a change of 18F. These conversions are illustrated below.

The temperature in the cooler is 10C, how many F is it?

use T(F) = 1.8 * T(C) + 32, so T(F) = 1.8 * 10C + 32 = 50F

The temperature in the cooler increase 10C, how many F did it increase?

use ΔT(F) = 1.8*ΔT(C), so ΔT(F) = 1.8 * 10C = 18F


Example 3.b.1:

Convert a temperature of 373K to degrees Celcius.




Example 3.b.2:

Convert a temperature of 398K to degrees Fahrenheit.





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