Assume that steam has formed in a boiler in...

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Question 1 of 205eccef9fbacbc34ba4d46c28

Assume that steam has formed in a boiler in which all of the steam stop valves are closed, and the water level is held constant. When there is an increase in the temperature of the steam and water in the boiler, which of the following effects will occur on the pressure and the specific volume of the steam?

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🔍 Key Concepts

• Behavior of a closed system with fixed volume (all stop valves closed, boiler is a rigid container) • Relationship between pressure, temperature, and specific volume for steam/water mixtures in a closed vessel • Meaning of specific volume (volume per unit mass) and how it changes when steam gets hotter or denser

💭 Think About

• If the boiler is closed and rigid, can the total volume of contents change? What about the mass of water + steam? How does that affect specific volume? • As temperature of the steam/water increases in a sealed, constant-volume container, what usually happens to the pressure of the vapor? Think about a pressure cooker. • For steam specifically: when it gets hotter at constant total volume and mass, does the steam become more dense or less dense, and how does that affect its specific volume?

✅ Before You Answer

• Confirm that in a rigid, sealed boiler with all stop valves closed, the total volume is fixed and the mass of steam+water is constant. • Recall that specific volume = volume ÷ mass. If neither total volume nor mass changes, what happens to specific volume overall? • Think about steam tables or basic gas behavior: at higher temperature in a fixed volume, the pressure must respond in a predictable way—decide which options match that behavior.

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