An air mattress is an inflatable mattress or sleeping pad.
An air mattress as might be used for temporary guest accommodation
Early air mattress by the German engineer Konrad Kyeser (c. 1405)
An air mattress in the shape of a mobile phone
An inflatable is an object that can be inflated with a gas, usually with air, but hydrogen, helium, and nitrogen are also used. One of several advantages of an inflatable is that it can be stored in a small space when not inflated, since inflatables depend on the presence of a gas to maintain their size and shape. Function fulfillment per mass used compared with non-inflatable strategies is a key advantage. Stadium cushions, impact guards, vehicle wheel inner tubes, emergency air bags, and inflatable space habitats employ the inflatable principle. Inflation occurs through several strategies: pumps, ram-air, blowing, and suction.
Balloons are the most common type of inflatable.
An inflatable castle type of moonwalk.
An inflatable boat.
An inflated vehicle tire