ABSA 4th Class Practice Exam

When steam is suddenly released from a boiler, the pressure within the boiler drops rapidly. This phenomenon occurs due to the principles of thermodynamics involving the properties of steam and the behavior of gases.

When steam, which exists in a high-pressure state within the boiler, is released, it creates a situation where the volume of steam in the confined space decreases. According to the ideal gas laws, if the volume of a gas increases while the amount of gas remains constant and the temperature remains consistent, the pressure must decrease.

Additionally, the release of steam leads to a drop in temperature and an immediate decrease in the energy available in the system. As steam escapes, the balance between pressure and volume shifts dramatically, resulting in a rapid decline in pressure within the boiler itself. This is an important operational consideration in managing a boiler system effectively.

Thus, the correct understanding of this scenario is that the pressure drops significantly when steam is suddenly released.