Calculate the ΔT percent error = |experimental - theoretical | x 100 = experimental

- theoretical | / theoretical

For example, let's say the theoretical value of ΔT is 20 and the experimental value is 18.

Calculating the percent error:

|18 - 20| x 100 = | -2 | x 100 = 2 x 100 = 200%

So, the percent error in this case is 200%.