Class 5 Boiler Practice Exam

At what temperature does water turn into steam under normal atmospheric pressure?

1. 100°F

2. 212°F

3. 150°F

4. 180°F

The correct answer is: 212°F

Water turns into steam at 212°F (100°C) under normal atmospheric pressure (1 atm). This temperature is known as the boiling point of water, where the liquid water molecules have enough energy to overcome intermolecular forces and transition into the gas phase. At this point, water begins to form steam, which is an essential concept in understanding boiler operations and thermodynamics. Understanding boiling point is crucial for anyone working in fields involving heat transfer, such as in boilers, where steam is often a primary working fluid. Other temperatures listed do not represent the boiling point under standard conditions; therefore, they do not apply to this question regarding the transformation of water to steam in atmospheric conditions.