What is the temperature difference from -10C to Standard Test Conditions (STC)?

To determine the temperature difference from -10°C to Standard Test Conditions (STC), which is 25°C, you'll need to calculate the delta temperature by subtracting the initial temperature from the reference temperature.

Starting with the STC temperature, which is 25°C, you subtract -10°C (the initial temperature). Mathematically, this is expressed as:

Delta T = STC - Initial Temperature Delta T = 25°C - (-10°C)

When you subtract a negative number, this is the same as adding that number:

Delta T = 25°C + 10°C = 35°C.

Since you're evaluating the change from a cold temperature to a warmer standard, the delta temperature reveals how much warmer the condition needs to be, thus the difference is a positive value, but referring to how much increase in temperature from -10°C it would take to reach the STC. Therefore:

Delta T = 25°C + 10°C = 35°C.

This means that the temperature difference from -10° to STC is indeed 35°C, hence the correct answer aligns with the calculation leading to that value.