What does the term 'saturated steam' mean?

Saturated steam refers to steam at the specific temperature where it exists in equilibrium with liquid water at a given pressure. This means that at this temperature and pressure, some water molecules will be in the vapor phase (as steam) and some will be in the liquid phase. This equilibrium condition allows for the coexistence of both states—steam and liquid water—without any heat being added or removed from the system, which would lead to a change in state or temperature.

In a saturated state, the steam has the maximum amount of vapor possible for that particular pressure and temperature, making it an important concept in thermodynamics and steam systems, particularly when considering the efficiency of heat transfer and the operation of boilers.