1. The problem involves calculating the temperature difference $\Delta T$ between two points A and B. 2. The formula used is $\Delta T = \Delta T_{b,B} - \Delta T_{b,A}$, where $\Delta T_{b,B}$ and $\Delta T_{b,A}$ are the temperature values at points B and A respectively. 3. Given values are $\Delta T_{b,B} = 2.08$ and $\Delta T_{b,A} = 0.728$. 4. Substitute the values into the formula: $$\Delta T = 2.08 - 0.728$$ 5. Perform the subtraction: $$\Delta T = 1.352$$ 6. Therefore, the temperature difference $\Delta T$ is 1.352 degrees Celsius.