What powered the earliest practical windmills?

Wind.

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Why: Windmills and wind pumps appeared in the Muslim world by the 9th century.

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References

Answer: Wind. Windmills and wind pumps appeared in the Muslim world by the 9th century.

  1. Engineering en.wikipedia.org/wiki/Engineering
    The earliest practical wind-powered machines, the windmill and wind pump
    Checked 2026-11-07.

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