Definition
The lowest temperature at which a liquid, typically a lubricating oil or fuel, will still flow under standard test conditions. Below this temperature the liquid becomes too thick or waxy to pour or circulate.
Plain English
The coldest temperature at which an oil or fuel will still flow. Any colder and it stops moving like a liquid.
Context Anchor
Seen in maintenance, aircraft servicing, and cold-weather operating discussions for oils, fuels, and hydraulic fluids.
Derivation
From 'pour' (to flow out of a container) plus 'point' (a specific value on a scale). The name simply marks the temperature point at which the liquid stops being pourable.
Why Pilots Care
Determines if fuel and lubricants will remain usable in low temperatures, preventing flow restrictions that could affect engine operation.
Analogy
Honey straight from the cupboard pours easily. Honey from the fridge barely moves. The pour point is the temperature where it crosses from one to the other.
Grounding Statement
Picture jet fuel in a wing tank on a freezing night; the pour point tells you if it will still reach the engine when needed.
Intuition Check
Pour point does not mean the fluid is frozen solid below that temperature. It means the fluid has become too thick to pour or flow reliably under the test conditions.
Example Sentence 1
Before a winter departure from a cold-soaked ramp, the mechanic confirmed the engine oil had a pour point well below the forecast overnight low.
Example Sentence 2
Pilots check the pour point of jet fuel to confirm it meets requirements for operations in subzero temperatures.