Standard temperature and pressure for gases

STP standard temperature and pressure for gases 0°C and 1 atm pressure, stress a change in conditions imposed on a system at equilibrium, strong acid an acid that reacts completely with water to form ions. 

To size a rotameter requires calculating the volumetric flow rate of a standard fluid at standard conditions. Most manufacturers calibrate rotameters using a stainless-steel float and water at a standard temperature for liquids and air at a standard temperature and pressure for gases. For other fluids, float materials, and operating conditions, the flow rate must be converted to an equivalent flow rate of water or air. To derive a formula for making this conversion, Bernoulli s equation is applied across the float shown in Figure 8.15 to give Equation 8.9. 

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