Document xz3Xn2X27K79LM0aYa9k8mgOG

12 CHAPTER 2 1954 Guide Direct-current (as adjective) Electromotive Force....... Feet per minute..................... Feet per second..................... Foot.................... d-c emf fpm fps ..ft Foot-pound................................................................................................................. ft-lb Foot-pound-second (system).......................................................................................fps Freezing point................................... ....... .............. ............ . fp Gallon..................................................... gal Gallons per minute.............................................. ....... ..... .......................gpm Gallons .per second........................................................................................ gps Gram................................................................... ....................................................... '. .\g Gram-calorie........ ,g-cal Horsepower............................................................................ hp Horsepower-hour........... ................................................ ............ . . hp-hr Hour............................................... .............................................................................. hr Inch-................................................................ ............. .......... ............................. . .... in. Inch-pound........................................................... ................... ................. . .in.-lb Indicated horsepower.....................................:......... ............ ....... ;...... .ihp Indicated horsepower-hour....-.-- ..........................................ihp-hr Kilogram........................................................... ..................;----- . . ....:............... .. . kg Kilowatt.................. ........ ........................................ .............................. ..kw Kilowatt-hour........................................................................................... .........kwhr Mass.................................... .................................... ............... ....:............. ;....! .mass Melting point ............................................................................................................ mp Meter...................................................................................................... m Micron..................................................................... ........................................... p (mu) Miles per hour............................................................................................................ mph Millimeter................................................................................... mm Minute..........................................................................................................................min Molecular weight......... Mol................................. Ounce..................... Pound.................... Pounds per square inch Pounds per square inch, gage.... Pounds per square inch, absolute Revolutions per minute............... Revolutions per second................. Second........................................... mol wt ' __ mol .......oz .......lb ___psi psig psia rpm .rps .sec Specific gravity............................................................... sp gr Specific heat................................................................................................................... spht Square foot................................................. sq ft Square inch................ .............................................................................................sq in. Watt...................................................................................................................... ....... w Watthour...................................................................................................... ............ whr SYMBOLS A letter symbol is a single character, with subscript or superscript if required, used to designate a physical magnitude in mathematical equa tions and expressions. Two or more symbols together always represent a product. The following have been compiled from a selected list of approved standards.3 Additional symbols and variations in the standard symbols Letter Symbols for Mechanics of Solid Bodies, Z10J-1942, and Letter Symbols for Heat and Thermo dynamics, Z10.4-1943 {American Standards .Association). Abbreviations and Symbols .13 found necessary in the individual chapters will be found in a list at the end of Chapters 3, 4,13, 32,36, and 47. Acceleration, due to gravity................................................................................................. g Acceleration, linear.................................... ............. ........................................ ......................a Area......................................... V.....'..................................................................................... A Change in specific volume during vaporization,................................. ..........................vtt Density, Weight per unit volume, Specific weight....................................... d or p (rho) d=v Distance, linear............................................. .................. .*......................................................s Dry saturated vapor, Dry saturated gas at saturation pressure and temperature, vapor in contact with liquid.......................................................... ..........Subscript g Efficiency.......... . !....... ........... ......... .......................................... V Elevation above some datum................... ................................................................... z, Z Emissivity..................................................................................................................................t Energy in general; work, total; work, molal................................................................... E Entropy. (The capital should be used for any weight, and the small letter for unit weight)..............................................................................................................S or s Force, total load...................................................................................................................... F Gas Constant, in equation pV = nRT..... ................. ......................................................R Head...................................................... ............. ......... .......................... ........H or h Heat content, Total heat, Enthalpy, (The capita] should be used for any weight and the small letter for unit weight)._____V...................................... H or h . Heat content of saturated liquid, Total heat of saturated liquid, Enthalpy of saturated liquid, sometimes called heat of the liquid............. ........... ............... ht Heat content of dry saturated vapor. Total heat of dry saturated vapor, En thalpy of dry saturated vapor...................................................................................... ft* Heat of vaporization at constant pressure....... ................. .......................: . L or ht. Hydraulic radius.................................................................................................................... Ra Internal energy, Intrinsic energy. (The capital should be used for any weight and the small letter for unit weight)................................................................ U or u Length of path of heat flow, thickness................................................................ L Load, total................................................................................................................................W Mechanical efficiency.................... ,......................................................................................Cm Mechanical equivalent of heat..... ......................................................................... J Power, Horsepower, Work per unit time.................. ................................................ .. .P Pressure, Absolute pressure, Gage pressure, Force per unit area.................;.___ p Quantity (total) of fluid, water, gas, heat; Quantity by volume; Total quantity of heat transferred...................................................... Q Quality of steam, Pounds of dry steam per pound of mixture.....................................x Reynolds Number..................................................................................... Nr, Saturated liquid at saturation pressure and temperature. Liquid in contact with vapor..................................................................................................................Subscript f Specific heat:................... ...................... ............................. ..................... ............. c Specific heat at constant pressure........................................... cp Specific heat at constant volume. -........... ........... ...................................................Cv Specific volume, Volume per unit weight, Volume per unit mass............. ................. v Temperature (ordinary) F or C. (Theta is used .preferably only when t is used for Time in the same discussion).......... .................................................. t or 0 {theta) Temperature (absolute) F abs or K. (Capital theta is used preferably only when small theta is used for ordinary temperature)....................... T or 0 {capital theta) Thermal conductance:1 heat transferred per (unit time) (degree)................ ......... C C= -=--= 9 R L ti -- ts 4 Terms ending ivity designate properties independent of dse or shape, sometimes called speeifie proper ties. Examples: conductivity, resistivity. Terms ending anee designate quantities depending not only on the material, but also upon size and shape, sometimes called total quantities. Examples: conductance, transmittance. Terms ending ion designate rate of heat transfer. Examples', conduction, transmission.