Document EdwxY8GKo75vJMn5BmeoOq33g

12 CHAPTER 2 1952 Guide / ' Direct-current (as adjective) ................................................... :.d-c Electromotive Force...................................................................................................... emf Feet per minute.............................. fpm Feet per second.......................................................................................... fps Foot........................ 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.............. Micron............ Miles per hour. Millimeter....... Minute............ . .m a (mu) .. .mph ... .mm .. .min Molecular weight...... .................................................... .........................................mol. wt Mol........................... .mol Ounce............................... .oz Pound.............................................................;................................................................... lb Pounds per square inch.................................................................................... psi Pounds per square inch, gage....... *............................................................. .........psig Pounds per square inch, absolute........................................................... ........ ........ .psia Revolutions per minute................ rpm Revolutions per second................... Second......................................................... rps sec Specific gravity .........................................................................:.......... ...........sp gr Specific heat........ .................................................................................................. sp ht 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.8 Additional symbols and variations in the standard symbols Letter Symbols for Mechanics of Solid Bodies, Z10.3-1942, and Letter Symbols for Heat and Thermo dynamics, Z10.4-1943 (American Standards Association). Abbreviations and Symbols 13 f__o__u__nd nece__s__s__a__r^y --in -t--h----e-----i--n----d----i-v- idual chaptersu witiiull buve. ifvouuintud iiun aa uliositi'aabt tihuec eeunud of Chapters 3, 4, 12, 31, 35, and 46. , ' "' ; ` ' Acceleration, due to gravity..............^...................... ....................................................g Acceleration, linear........................ .............. .........:.......................................................a Area...................... ...................................................................................................... A Change in specific volume during vaporization........................ .......... ...... ...........vu Density, Weight'per unit volume. Specific weight.i.i....... . .'.ij.brp (rho) Distance, linear,..................... ........ ,...................i.......................................................... j Dry saturated vapor, Dry saturated gas at saturation pressure and temperature, vapor in contact with liquid........... ................ .................. Subscript g Efficiency................ ..................... .................. ............. .,:......................... .'............. n Elevation above some datum...... ............................ ...................................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 ..................................... ............................................ 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.......... .......................................................... ..... ht Heat of vaporization at constant pressure...,..... ........................ .... ...... A 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........ ............................................................................. ...............................JF Mechanical efficiency...................... ................... ..............:........ ................................ * Mechanical equivalent of heat...... ................................................................................ 3 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-- .... / Reynolds Number............................................ ....................................................... .Ala. 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.. i........... -------- >.. Specific volume, Volume per unit weight, Volume per unit mass.............-.r......... : .v Temperature (ordinary) F or C. . (Theta is used preferably only when ( is used for Time in the same discussion)...... i^......................t 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 8 (capital theta) Thermal conductance:* heat transferred^per (unit time) (degree).......... ...........C c,, I=M g R Jj- U -- . Terma ending icily designate properties independent of sue or shape, sometimes called specific proper- Examples: conductivity, resistivity. Terms ending ante designate quantities-depenoing not only on the material, but also upon size and shape, sometimes called total guanlilie*. Examples: conductance, tt&n&mittance. Terms ending ion designate rate o! beat transfer. Examples: conduction, transmission.