Document GVod8Y75jZxbLwX6zkQGQ58r

12 CHAPTER 2 1958 Guide Direct-current (as adjective)! Electromotive Force....... Feet per minute......... Feet per second........... t: Foot................................... '!.! Foot-pound............... Foot-pound-second (system). Freezing point................ .... Gallon..................................... Gallons per minute............... .......d-c ___emf ___fpm ....... fps .........ft ft-lb . .fps . ..fp . gal .gpm Gallons per second Gram...................... .... ------ Gram-calorie......... .............................. Horsepower............................... Horsepower-hour............... . . . . . A ....... -gps ...................g ........g-cal .............. hp ...........hp-hr Hour................. ......... Inch... ................. Inch-pound.. . . . ..... Indicated horsepower. . Indicated horsepower-hour,. Kilogram................... Kilowatt................... Kilowatt-hour.......... Mass.......................... Melting point.......... ....... hr !... .in. .. in.-lb .. :ihp ihp-hr A.kg .. .kw .kwhr .mass .'.inp Meter.............. Micron............ Miles per hour. Millimeter...... Minute............ Molecular weight Mol.............. :... Ounce................................... ........................................ Pound......................................................................... Pounds per square inch...................... ...................... ....... m M (mu) ... mph i...mm . 1. min . mol wt ___mol .........oz ...... lb ___.psi Pounds per square inch, gage Pounds per square inch, absolute Revolutions per minute............... Revolutions per second............... Second........................................... Specific gravity Specific heat-- Square foot...... Square inch-- Watt..:............ Watthour......... psig psia rpm .rps .sec sp gr . sp ht .sq ft sq in. :, w . .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.' Additional symbols and variations in the standard symbols Letter Symbols for Mechanics of Solid Bodies, Z10.3-1948, and Letter Symbols for Heat and Thermo dynamics, Z10.4-1913 (American Standards Association). {(Abbreviations, Symbols, ConversioffiFactors? 13 found necessary in'the individual chapters will be found in a list at the end - of Chapters 3, 4, 13, and 47. Acceleration, due to gravity............................ Acceleration, linear........... 9 o Area................................................................................... Change in specific volume during vaporization............ ............................... . Density, Weight per unit volume, Specific weight...................... ..d or p (rho) vts d= Distance, linear.............................................................................................................. s Dry saturated vapor, Dry saturated gas at saturation pressure and temperature, vapor in contact with liquid.................................................................. Subscript g Efficiency..!. ,.........:...................... ................................,..............----- ij Elevation above some datum........... ................:........ ........ J........z, Z ' Emissivity................................. ........................................:............................. ............... 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.......... .................. ..vi. ....... .R Head......................................................... ......... ..................................... .H or h Heat content, Total heat, Enthalpy. (The. capital should be used for any " " weight and the small letter for unit weight)-----.....___ H or h Heat content of saturated liquid, Total heat of saturated liquid; Enthalpy of saturated liquid, sometimes called heat of the liquid.............. ......................... hi Heat content of dry saturated vapor, Total heat of dry saturated vapor, En thalpy of dry saturated vapor................................................................ Heat of vaporization at constant pressure..................... ................................1 or hts Hydraulic radius........................................................................ Rb Internal energy. Intrinsic energy. (The capital should be used for any weight and the small letter for unit weight)........................................................... U or Length of path of heat flow, thickness........................................................................ L Load, total............................................................................................................. .Mechanical efficiency................................................................. 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'.___............................. ^................. ............. ,c ^Specific volume. Volume per unit weight. Volume per unit mass...................... ....... Temperature (ordinary) F or.C. (Theta is used preferably only when t is used for Time in the same discussion).... . .iv......................... t or $ {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 hi W c g--= - = -- =____ R ' L li -- h 4 Terms ending ioily designate properties independent of .size or shape, sometimes called specific proper. te. Examples: conductivity, resistivity. Terms-ending ance designate quantities depending not only on the material, but also upon size and shape, sometimes, called total quantities. Examples: conductance, transmittance. Terms ending ton designate rate of beat transfer. Examples: conduction, transmission.