Definition 1 of 2
Definition
An airborne suspension of fine solid particles produced by combustion or industrial processes that reduces flight visibility and can degrade night vision by scattering and absorbing light, particularly the dim light pilots rely on after dark.
Plain English
Tiny particles in the air from fires or factories that make it harder to see, especially at night when there is already very little light to work with.
Context Anchor
Seen in night vision, weather, wildfire, and reduced-visibility discussions.
Derivation
Smoke comes from Old English words meaning smoke or vapor from burning. That origin helps because the aviation meaning is still the same basic idea: material from burning that is in the air and affects what the pilot can see.
Why Pilots Care
Smoke can eliminate visual cues needed for orientation, increasing the risk of spatial disorientation or controlled flight into terrain during night operations.
Grounding Statement
At night, even a thin layer of smoke can turn clear lights into faint, hazy spots and make the outside scene lose sharpness.
Intuition Check
Smoke does not only mean a visible cloud rising from a fire. In aviation, smoke can also mean a thin layer spread through the air that still reduces how well the pilot can see.
Example Sentence 1
Smoke from nearby wildfires reduced visibility along the route, so the pilot delayed the night cross-country flight.
Example Sentence 2
A layer of smoke reduced the visibility of runway lights during the night landing.