Superheated steam
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Superheated steam is steam at a temperature higher than its saturation temperature. If saturated steam is heated at constant pressure, its temperature will rise, producing superheated steam. This may occur in a boiler/autoclave if saturated steam is exposed to a surface with a higher temperature such as a boiler wall.
The steam is then described as superheated by the number of temperature degrees through which it has been heated above saturation temperature.
Superheated steam cannot exist whilst the steam is still in the presence of liquid water, as any additional heat simply evaporates more water.
Superheated steam is not suitable for sterilization.
