SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-thermal-lift

What is a thermal, the thing sailplane pilots search for?

A thermal is a rising column of warm air.

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  1. A sinking cold-air pocket
  2. A rising warm-air column ✔
  3. A steady crosswind

Why: Sun-warmed ground heats nearby air. That less-dense air rises, and a sailplane can circle in it to gain altitude.

Huh, didn't know that: Some ground soaks up the Sun's heat while other ground reflects it, so thermals form over some spots and not others.

The dad joke
The glider liked thermals because they were uplifting company.
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References

Answer: A rising warm-air column. Sun-warmed ground heats nearby air. That less-dense air rises, and a sailplane can circle in it to gain altitude.

  1. Aerospace Dimensions Module 1: Introduction to Flight akwg.cap.gov/media/cms/Module_1__Intro_to_Flight_CE64D2DBD1245_e4d7f.pdf
    It's these thermals that provide lift for sailplanes.
    Checked 2026-10-10.

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