Minnesota Boiler License Practice Exam

When the pressure of steam increases, what happens to the volume from a given amount of water?

1. Remains the same.

2. Decreases.

3. Increases.

4. Fluctuates.

The correct answer is: Decreases.

When the pressure of steam increases, the volume of the steam generated from a given amount of water decreases. This phenomenon is explained by the principles of thermodynamics, specifically the ideal gas law, which states that at a constant temperature, the pressure of a gas is inversely proportional to its volume. So, as the pressure increases, the gas molecules are forced closer together, resulting in a decreased volume of steam. In the context of boilers and steam systems, this relationship is crucial for understanding how steam behaves under varying pressure and temperature conditions. High-pressure steam can be used effectively for transferring energy and performing work in processes such as heating, mechanical power generation, and propulsion. By recognizing the impact of pressure on steam volume, operators can ensure that systems are correctly designed and maintained for efficiency and safety. This understanding is also vital for calculating boiler capacity and managing steam distribution in various applications.