Water Treatment Operator-in-Training (OIT) Practice Test

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The volume of chlorine increases ______ times when it is depressurized into gas?

The correct answer is: 450

When chlorine is depressurized from a liquid to a gas, it undergoes a significant increase in volume due to the change in pressure and temperature conditions. This expansion is particularly striking with chlorine, which can increase its volume by approximately 450 times when it transitions from its liquid state under pressure to its gaseous state at atmospheric pressure. The large expansion factor occurs because gases occupy much more space compared to their liquid counterparts. When chlorine is stored as a liquid, it is kept under pressure and at a temperature that maintains its liquid state. Upon release, as the pressure drops, the liquid chlorine quickly turns into gas, expanding to fill the available space. Understanding this behavior is crucial for water treatment operators, as it affects how chlorine is used for disinfection and how safety measures are implemented when handling chlorine gas, which can be hazardous in high concentrations.