High School

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Low-pressure acetylene gauges usually have a red line to indicate dangerous pressure levels above:

A. 5 psig (34.4 kPa)
B. 10 psig (68.9 kPa)
C. 15 psig (103.4 kPa)
D. 20 psig (206.8 kPa)

Answer :

Final answer:

Low-pressure acetylene gauges use a red line to indicate dangerous pressure levels above 15 psig (103.4 kPa). This safety measure is essential to prevent instability and potential explosions of the gas under pressure. So the correct answer is Option C.

Explanation:

It's important for safety that operators are aware of the maximum pressure beyond which acetylene becomes unstable and can pose a risk of explosion. On low-pressure acetylene gauges, the red line typically indicates dangerous pressure levels above 15 psig (103.4 kPa). Storage and handling guidelines for gases under pressure often reference the ideal gas law and consider factors like temperature and volume to determine safe operational practices.

For instance, when dealing with toxic gas in high-pressure cylinders, as mentioned in the provided examples, one must take care when these cylinders are damaged. Reducing temperature, such as cooling to dry ice temperature, can help reduce pressure within these cylinders for safe repair, demonstrating a practical application of gas laws to ensure safety. The correct answer to the student's question is: c. 15 psig (103.4 kPa).

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