How does temperature generally affect fuel weight?

The correct answer reflects the physical properties of fuel and how temperature influences density. As fuel gets colder, its density increases, meaning that a gallon of cold fuel will weigh more than a gallon of warm fuel. Conversely, when fuel is heated, it expands and becomes less dense, resulting in a lighter weight per gallon.

This relationship is governed by the principles of thermodynamics, particularly how liquids behave under various temperature conditions. For aviation fuel, which is typically a hydrocarbon mix, this effect is significant because accurate weight measurements are crucial for flight operations, including calculations for fuel loading and aircraft performance.

Understanding this concept is essential when assessing fuel states, especially in aviation, where precise weight and balance are vital for safety and compliance with operational standards.