Updraft

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An updraft is a current of rising air.[1] Updrafts can vary in speed, from a few feet per second to 6000 feet per minute.[2]

References

  1. Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000
  2. U.S. Department of Transportation, Federal Aviation Administration. Balloon Flying Handbook; p. 4-25, (2008) [1]