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more free magazines       Manometer Pressure Manometers measure a pressure difference by balancing the weight of a fluid column between the two pressures of interest. Large pressure differences are measured with heavy fluids, such as mercury (e.g. 760 mm Hg = 1 atmosphere). Small pressure differences, such as those experienced in experimental wind tunnels or venturi flowmeters, are measured by lighter fluids such as water (27.7 inch H2O = 1 psi; 1 cm H2O = 98.1 Pa). To calculate the pressure indicated by the manometer, enter the data below. (The default calculation is for a water manometer with a 10 cm fluid column, with the answer rounded to 3 significant figures.): Inputs  Height of fluid column, h: m in ft cm mm Fluid density, r: kg/m^3 lb/in^3 kg/l g/cm^3      Equations used in the Calculation The pressure difference between the bottom and top of an incompressible fluid column is given by the incompressible fluid statics equation, where g is the acceleration of gravity (9.81 m/s2).