content: An AirShip is a type of dirigible.  Blimps are a different type of dirigible.  A dirigible is a craft that floats in the air by being lighter than air, either from having a gas that is less dense than air, or hot air (as in a hot air balloon), or theoretically it is possible to have a vacuum AirShip in the future if we had superior materials. The difference between a blimp and an AirShip is that an AirShip has a rigid outer hull.