Final answer:
The reference to -125°C is about Charles's Law in physics, which indicates that at constant pressure, the volume of a gas decreases as the temperature decreases.
Step-by-step explanation:
The statement “This is also equal to -125°C. As temperature decreases, volume decreases which it does in this example.” is discussing a concept from physics related to the behavior of gases. In particular, it refers to Charles's Law, which states that for an ideal gas at a constant pressure, the volume of the gas is directly proportional to its absolute temperature (measured in Kelvin). Therefore, if the temperature of a gas decreases, as in the case of a temperature dropping to -125°C, its volume will also decrease, assuming the pressure remains constant.