# Fluid Power

 Matter Anything that has mass and takes up space Pressure Force per unit areaPounds per square in Mass The measure of a body’s resistance to accelerationDifferent from but proportional to weight Weight The gravitational force exerted on an object Density Amount of mass per unit volume Atmospheric Pressure Pressure due to the weight of the atmosphere above a certain point. Approximately 14.7 psi at sea levelLubbock is approximately 13.9 psi Specific Gravity Density of a fluid referenced to:Air if it is a gasWater if it is a liquid Absolute Pressure Referenced to a complete vacuumEquals gage pressure plus atmospheric pressure for positive pressures585 psig + 14.7 psia = 599.7 psiaEquals Complete vacuum minus gage vacuum for vacuums29.92 in Hg – 26 in Hg = 3.92 in Hg Absolute Temperature Temperature referenced to absolute zero-273oC = 0 Kelvin-459.7oF=0 Rankine Absolute Zero Point at which all molecular motion stops Equilibrium A state of balance between two opposing actions Compressibility The change in volume of a unit volume of a fluid when it is subjected to a unit change of pressure Force The action of one body on another tending to change the velocity of the body acted upon Friction The action of one body or substance rubbing against another, such as fluid flowing against the walls of pipeThe resistance to motion caused by this rubbing Inertia The tendency of a body at rest to remain at rest, and a body in motion to continue to move at a constant speed along a straight line, unless the body is acted upon in either case by an unbalanced force Energy The ability or capacity to do work Fluid Anything that has the ability to flowA liquid or gas Thermal Expansion A change in the volume of a substance due to a change in its temperature Velocity The rate of motion in a particular directionThe velocity of fluids is usually expressed in feet per second Power The rate of doing workThe rate of expanding energyPower = Work/Time Work The transference of energy from one body or system to anotherThat which is accomplished by a force acting through a distanceWork = Force * Distance Boyles Law The absolute pressure of a fixed mass of gas varies inversely as the volume, provided the temperature remains constant.P1V1=P2V2 Charles Law. If the pressure is constant, the volume of dry gas will vary directly with the absolute temperature.V1/T1=V2/T2 Avogadro’s Law At the same temperature and pressure, equal volumes of different gases contain equal numbers of molecules.6.023x1023 atoms per moleMole – The amount of pure substance that contains the same number of elementary entities as there are atoms in exactly 12 grams of the isotope carbon 12 Dalton’s Law of partial pressures A mixture of several gases which do not react chemically exerts a pressure equal to the sum of the pressures which the several gases would exert separately if each were allowed to occupy the entire space alone at the given temperature. Pascal’s Law A pressure applied to a confined fluid at rest is transmitted with equal intensity throughout the fluid Bernoulli’s Principle Pressure is inversely proportional to velocity.An increase in velocity of a fluid will cause decrease in pressure Newton’s Laws 1ST: A body at rest tends to stay at rest and a body in motion tends to stay in motion 2ND: An imbalance of force on a body tends to produce an acceleration in the direction of the force. This acceleration is directly proportional to the force and inversely proportional to the mass of the body F=mA3RD: For every action there is an equal and opposite reaction Authorpegwinn ID73605 Card SetFluid Power DescriptionFLUID POWER CHECKOUT Updated2011-03-18T03:00:37Z Show Answers