Answer :
Final answer:
Shielding gas supply for welding operations is best measured in litres per minute (cubic feet per hour) because gases exert pressure and are usually considered in terms of their flow rate. The density of gases also plays a crucial role where the SI unit is kg/m³ but for convenience, many gases use g/L. Tools such as manometers and gauges are common for this measurement.
Explanation:
The preferred method of measuring shielding gas supply for welding operations like MIG (Metal Inert Gas) and TIG (Tungsten Inert Gas) is option c) litres per minute (cubic feet per hour). This choice is based on the fact that gases exert pressure, and because they are used in welding operations they need to be measured in terms of their flow rate, which is best represented as a volume (in litres or cubic feet) per time (in minutes or hours). It is important to note that pressure is defined for all states of matter but is particularly important when discussing fluids like gases.
The SI unit of density, another important aspect when dealing with gases, is kg/m³. However, for many gases, it is convenient to measure density in grams per litre (g/L).
Devices like manometers for measuring gas pressures, and gauges like those shown in Figure 14.11 (a), are commonly used tools in measuring and monitoring pressure in gas cylinders.
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