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2008_8680_SP_Shenandoah Valley Hot Air Balloon
Hot air balloonists  at the Shenandoah Valley Hot Air Balloon Festival at Historic Long Branch in Millwood, Virginia blow air into the balloon "envelope."  After filling the balloon with air, they will fire a propane burner to heat the air.  Since hot air rises, this will eventually cause the balloon to stand up, then fly up.