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Unformatted text preview: 1 Phys 2101 Gabriela González 2 Density: mass per unit volume ρ = Δ m/ Δ V. If uniform, ρ = m/V SI units: kg/m 3 2 3 Pressure: force per unit area p = F/A SI units: N/m 2 = Pa NonSI units: 1 atm = 1.01x10 5 Pa = 760 torr =760 mm Hg 1 atm = 14.7 lb/in 2 (psi) 4 Pressure: force per unit area p = F/A SI units: Pa = N/m 2 = (kg m/s 2 )/m 2 = kg/(ms 2 ) NonSI units: 1 atm = 1.01x10 5 Pa 1.01 hPa = 760 torr =760 mm Hg = 29.9 in Hg 1 atm = 14.7 lb/in 2 (psi) 3 5 Pressure in fluids at rest increase with depth, due to weight of fluid on top: F = F + mg = F + (m/V)gV = F + ρ ghA p = F/A = p + ρ gh Pressure decreases when climbing mountains, and increases when diving: In both cases, be careful with pressure changes! A=area h 6 • How deep in the sea is the pressure twice as much the pressure at the surface? • Would the answer be different in a mountain lake? 4 7 How long should a mercury barometer be to measure 29 psi tire pressure?...
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This note was uploaded on 12/01/2011 for the course PHYS 2101 taught by Professor Grouptest during the Fall '07 term at LSU.
 Fall '07
 GROUPTEST
 Physics, Force, Mass

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