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Measuring Fluid Pressure. Sample data: Alcohol Height (m)Pressure (Pa) 0.131000 0.262000 0.393000 0.524000 0.655000 0.786000.

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Presentation on theme: "Measuring Fluid Pressure. Sample data: Alcohol Height (m)Pressure (Pa) 0.131000 0.262000 0.393000 0.524000 0.655000 0.786000."— Presentation transcript:

1 Measuring Fluid Pressure

2 Sample data: Alcohol Height (m)Pressure (Pa)

3

4 Slope of Pressure vs height Slope = rise/run = Pressure/height Pa = N = kg m = kg m m m 2 m m 3 sec 2 m 3 sec 2 kg/m 3 = density = ρ m/sec 2 = acceleration

5 Best fit equation = slope Alcohol = x Y= mx + b Pressure = h + b ( b can be disregarded. When pressure = 0 then height would = 0)

6 Pressure vs height Pressure (Pa) Height (m) Glycerin Salt water Fresh water Alcohol

7 Pressure vs density using the best fit lines LiquidDensity (ρ) Kg/m 3 Best fit equation Equation at 0.4 m Alcohol h2830 Freshwater h3924 Saltwater h4033 Glycerin h5415

8

9 Pressure is proportional to height P α h and P α ρ So therefore: P α ρ h × some constant C P = C ρ h

10 C = P = Pa = N/m 2 * m 3 ρ h kg/m 3 * m kg * m = kg * m * m 3 m 2 * kg * m * sec 2 C = m/ sec 2

11 Finding C (using data for seawater) P = C ρ h C = P = 1 P ρ h ρ h C = 1 * C = 9.81 m/sec 2 Slope Trend line formula


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