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Lift air, like other gases, is considered a fluid because it takes the shape of the surrounding vessel. In the case of a hovercraft, the air takes the shape of the lower part of the hovercraft, the inner edges of the skirt, and the surface that is overflying. The fan blowing air under the bottom of the hovercraft continues to push more and more air under the hovercraft, thus increasing the pressure in the air cushion. The pressurized air cushion exerts a force on its container (the bottom of the hovercraft, the skirt and the surface on which the hovercraft rests). When the force that this pressurized air exerts on the surface grows to equal the weight of the hovercraft, it becomes floating (like a boat in the water) and begins to float in the air.
When a hovercraft swings, it will lift as high as the designed shape of the skirt will allow it. Lifting the air begins to escape through the gap between the bottom of the skirt and the surface that has finished. The size of this gap will be large enough for the same amount of air to escape through the gap that is pushed by the fan, keeping the pressure inside the air cushion constant. Normally, this air gap will be between 0 and ½ inches [12.7 mm] between the bottom of the skirt and the surface and is called play in the daylight.