<P> Superheated steam and liquid water cannot coexist under thermodynamic equilibrium, as any additional heat simply evaporates more water and the steam will become saturated steam . However this restriction may be violated temporarily in dynamic (non-equilibrium) situations . To produce superheated steam in a power plant or for processes (such as drying paper) the saturated steam drawn from a boiler is passed through a separate heating device (a superheater) which transfers additional heat to the steam by contact or by radiation . </P> <P> Superheated steam is not suitable for sterilization . This is because the superheated steam is dry . Dry steam must reach much higher temperatures and the materials exposed for a longer time period to have the same effectiveness; or equal F0 kill value . Superheated steam is also not useful for heating . Saturated steam has a much higher wall heat transfer coefficient . </P> <P> Slightly superheated steam may be used for antimicrobial disinfection of biofilms on hard surfaces . </P> <P> Superheated steam's greatest value lies in its tremendous internal energy that can be used for kinetic reaction through mechanical expansion against turbine blades and reciprocating pistons, that produces rotary motion of a shaft . The value of superheated steam in these applications is its ability to release tremendous quantities of internal energy yet remain above the condensation temperature of water vapor; at the pressures at which reaction turbines and reciprocating piston engines operate . </P>

What is the temperature of high pressure steam