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Operating ratios are types of ratios that serve as gauges of a company's operating success (or profitability) for a given period of time. They are also known as profitability ratios.
No, it is the DIFFERENCE between the true and atmospheric pressures.
The operating system
Operating System.
Because lead is very durable and resists corrosion and has a smooth inner surface and can with stand higher pressures then other materials of the time as lead has various wall thicknesses depending on the actual working pressures Lead was used for water pipes because it is very durable and resists corrosion. Lead also has a very smooth surface, and is available in various thicknesses; allowing for the tolerance of higher water pressures than other material options.