A patient lying on a mattress of enclosed air is less likely to develop decubitis ulcers because the:

C: An air mattress flexes around a patient’s body so that it conforms more closely to their curved shape. Consequently, the area of contact between the patient and the supporting surface is increased. This increased area means that the pressure will be decreased. This lower pressure is less likely to compress the blood vessels that supply the skin and so circulation will not be cut off. Hence ulcers will be avoided.