Document 7OaY9exgopb0Z4yboyLxmXjva

12 CHAPTER 2 1950 Guide Direct-current (as adjective)................................................................................ --d-c Electromotive Force............ ......... .............................................................................. emf Feet per minute................................. fpm Feet per second........ ............................................................. ....................................... fps Foot................... ft Foot-pound............ ............. < Foot-pound:8econd (system) Freezing point .............. .'... Gallon.................................... Gallons per minute................ ft-lb ,.f ..gal gpm Gallons per second................. Gram. .............................. Gram-calorie.......................... Horsepower................ .-....... Horsepower-hour................... g-cal ...hp hp-hr Hour........... ........ ...... ....... ............................................ ......... ....................... ................hr Inch..................................... ;----- :....;..................... ......................................... ....;.. .in. Inch-pound......................... ............................ 1..............;.................... ........... .in.-lb Indicated horsepower................... .................................................. ............................ ihp Indicated horsepower-hour......... '........ ...................... ... ............. ......._______ ihp-hr Kilogram........... ....................... ...............: ........... ....... 1................ I v................:kg Kilowatt........... . >.......... ............ ............................. ......................... ............. ............ kw Kilowatthour........ _______ '............. -.......................... .-.......................'........ :........... kwhi" 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 .mol. wt ------mol ......... oz ......... lb ....... psi Pounds per square inch, gage___ Pounds per square inch, absolute Revolutions per minute............... Revolutions per second................. Second............................................. psig psia rpm. .rps .sec Specifio gravity Specific heat... Square foot....... Square inch Watt.................. Watthour. sp gr.spht .sqft . sqin, . -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 far Heeh&mcs of Solid Bodies,Z10.3-1942, 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, 5, 12, 31, 35, and 36. Acceleration, due to gravity.................................... v.................................................... 9 Acceleration, linear............................... ............................................................................. a Change in specific volume-during vaporization.......................................................... t>u Density, Weight per unit volume, Specific weight?........................................ d or p (rho) 1 d 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..............................................'.............................................................................. e 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 capital should be used for any weight and the small letter for unit weight)........ ............................... H or A Heat content of saturated liquid, Total heat of saturated liquid, Enthalpy of saturated liquid, sometimes called heat of the liquid.......................................... fa Heat content of dry saturated vapor, Total heat of dry saturated vapor, En thalpy of dry saturated vapor.................................................................................. fa Heat of vaporization at constant pressure......... ...................... ...................L or fa. Hydraulic radius............................................... _...................:......................................... Rh Internal energy. Intrinsic energy. (The capital should be used for any weight and the small letter for unit weight)................................................ ............... XJ or u Length of path of heat flow, thickness........................................................................... L Load, total............................................................................................................................ W Mechanical efficiency...........................................................................................................Cm Mechanical equivalent of heat............................:........................................................ V 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...... ........................ z Reynolds Number............................................................................. -Ah* . Saturated liquid at saturation pressure and temperature, Liquid in contact with vapor............................................ ....................................,,.;......................Subscript f Specific heat-----:................ .......------------------------- ....------....:............ ...........'.c Specific heat at constant pressure....... .....................................:..........:.\cr Specific heat at constant volume.,............. ...................... ..........................'...c* Specific volume, Volume per unit weight, Volume per unit mass......... ;;t> Temperature (ordinary) F or C. (Theta is used preferably only when t is used for Time in.the same discussion)___ ............. ............... ....... ......< or 6 {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:4 heat transferred per (unit time) (degree). ........ ......... C 1 kA . g C R .E (i -- if 4 Tenoa ending ivity designate properties independent of size or shape, somotimes called specific properties. Examples: conductivity, resistivity. Terms ending ones 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 heat transfer. Examples: conduction, transmission.