🔍 Key Concepts
• Use the Properties of Saturated Steam table to find the saturation temperature that corresponds to 29.00 inches Hg vacuum.
• Compare the given temperature (85.21°F) with the saturation temperature at 29.00 inches Hg to decide if the fluid is subcooled, saturated, a mixture, or superheated.
• Recall the definitions of subcooled liquid, saturated liquid / mixture, and superheated vapor in terms of temperature being below, at, or above the saturation temperature at a given pressure.
💭 Think About
• At a fixed pressure (or vacuum), what does it mean physically if the actual temperature is higher than the saturation temperature from the table?
• What if the actual temperature is exactly equal to the saturation temperature, or lower than it—how would that change the phase description?
• Notice that 85.21°F also appears in the table at a different vacuum value; how does that help you understand whether, at 29.00 inches Hg, the fluid is saturated or not?.
✅ Before You Answer
• From the table, write down the saturation temperature at 29.00 inches Hg vacuum and compare it numerically with 85.21°F.
• Match each choice to its condition relative to saturation: T < Tsat, T = Tsat, or T > Tsat at the specified pressure.
• Before choosing, confirm you are using the pressure (vacuum) given in the question, not the one that matches 85.21°F in the table.