Final answer:
Pressure (p) for H2O at T=140°C and υ=0.5 m3/kg is found using thermodynamic tables and charts, but an exact value requires specific resources, and the state can be sketched on a T-υ diagram above the saturation dome, likely in the superheated steam region.
Step-by-step explanation:
To determine the specified property pressure (p) for water (H2O) at a given state with a temperature (T) of 140°C and a specific volume (υ) of 0.5 m3/kg, we would refer to the phase diagram of water. Typically, the pressure at such a temperature and specific volume can be found using steam tables or thermodynamic charts, since the information provided falls outside of the typical phase diagram which shows states of matter rather than specific volumes.
Given that the question is likely seeking properties that pertain to regions where water may exist in a superheated or supercritical state, you would look for a point at a constant temperature of 140°C and read off the corresponding pressure for the specific volume of 0.5 m3/kg. Without the precise resource or chart in front of us, we cannot provide an exact value, but we recommend using water property data tables or software designed for thermodynamic property determination to find the pressure under these conditions.
To sketch the state on a T-υ diagram for the given temperature and specific volume, you would plot a point above the saturation dome at 140°C, which would likely place it in the region corresponding to superheated steam, provided that the specific volume of 0.5 m3/kg is above the saturation line at this temperature.