What measurements can be used when measuring gas flow from the torch nozzle?

• A. Liters per minute (LPM)
• B. Cubic feet per hour (CFH)
• C. CFH or LPM
• D. Gallons per minute

Answer: (C)

Gas flow from a torch nozzle is a rate of volume over time. In welding and related work, this flow is commonly expressed in CFH (cubic feet per hour) for imperial units or in liters per minute (LPM) for metric units. Both units describe how much gas passes through the nozzle each minute (or hour), and which one you use depends on the unit system you’re working with. That’s why the best answer lists both CFH and LPM—they cover the two standard ways people measure gas flow. Gallons per minute isn’t typically used for gases in this context, and choosing a single unit wouldn’t reflect the common practice across different shops.