PHYS 101 Chapter Notes - Chapter 10: Total Pressure, Atmospheric Pressure, Mass Flow Rate

• School: Simon Fraser University
• Department: Physics
• Course: PHYS 101
• Professor: Eldon Emberly

Document Summary

3 states: solid, liquid and gas: solid- fixed shape & size, liquid doesn"t maintain shape but flows & not compressible, gas not fixed shape nor size but expands, 4th phase can be plasma. Density (p): rho, mass per unit volume: p = m/v, si units: kg/m^3 independent of size, mg = pvg. Specific gravity: ratio of substance density to water density at 4 celsius: no units (ratio) Sfu: fluid pressure is proportional to liquid density & liquid depth, pressure at equal depth within uniform liquid is the same, p = pg h, pressure changes with depth. Gases are very compressible & density varies with depth. Atmospheric pressure: standard pressure of air: 1 atm = 1. 013 x 10^5 n/m^2 = 101. 3 kpa. Pressure inside straw (finger at the top) must be smaller than pressure outside so fluid stays still thus upward force from po is more than downward force from pressure inside the straw.