🔍 Key Concepts

• Saturated steam tables relate a unique temperature to each pressure (or vacuum) when liquid and vapor coexist in equilibrium. • At a given pressure (or vacuum), compare the actual temperature to the saturation temperature from the table. • Know the meaning of each term: subcooled (compressed) liquid, saturated mixture, and superheated vapor in relation to saturation temperature.

💭 Think About

• From the table, find the saturation temperature that corresponds to a gauge vacuum closest to 28.09 inches Hg. How does that temperature compare to 117.99°F? • If the actual temperature is below, equal to, or above the saturation temperature at that pressure, what does that say about whether the fluid is liquid, a liquid–vapor mixture, or vapor? • Think about whether water at this pressure could remain a liquid at that temperature, or if it must be in the vapor region.

✅ Before You Answer

• Identify the saturation temperature at 28.09 inches Hg (or the nearest listed value) from the illustration’s table. • Compare 117.99°F carefully with the Fahrenheit value you found—note whether it is higher, lower, or the same. • Match that comparison to the correct definition: subcooled liquid (T < Tsat), saturated liquid/mixture (T = Tsat), or superheated vapor (T > Tsat).