Discussion
The lowest temperature at which the fuel ceases to flow is known as ______.
Answer: A
The temperature is the pour point.
The pour point is the lowest temperature at which a fuel or oil still flows (pours) under standard test conditions; below it, wax crystals and rising viscosity stop the fuel flowing. It matters for diesel used in cold weather, because a fuel below its pour point cannot reach the injection pump.
The cloud point is the higher temperature at which wax first appears as a haze, while the fuel still flows. The flash point is the lowest temperature at which the fuel gives off enough vapour to ignite momentarily in air, a safety property for storage. The boiling point is where the liquid boils, which is unrelated to cold flow.
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