In order for a high temperature boller or steam engine to produce superheated water, or steam: the water must be permitted to evaporate quickly the heat source must be greater than 100^circ C the system must be sealed and become pressurized above atmospheric pressure the vapor pressure must be kept below 760 mm(Hg)

To produce superheated steam in a high-temperature boiler or steam engine, the correct condition is:<br /><br />- **The system must be sealed and become pressurized above atmospheric pressure.**<br /><br />Superheated steam is produced when water is heated beyond its boiling point without increasing its pressure, which typically requires the system to be under pressure. This allows the steam to reach temperatures higher than 100°C (212°F) at atmospheric pressure. The other options do not specifically address the conditions necessary for producing superheated steam.