Final answer:
The property of water vapor mentioned in the scenario is temperature. The water vapor enters a turbine at a specific temperature of 700°C.
Step-by-step explanation:
The property of water vapor mentioned in the scenario is temperature. The given information states that the water vapor enters a turbine at a specific temperature of 700°C. Temperature is a measure of the average kinetic energy of particles, so in this case, it indicates the thermal energy of the water vapor as it enters the turbine.