Document ZBK9zQ01oryEmNbM9Yg1RZyKp

12 CHAPTER 2 1946 Guide Direct-current (as adjective).................................................... .......................................d-c Electromotive Force....'............. .......... .......................................... ............................. .... emf Feet per minute.____:_________ ______ ......... ...... .... ............. .... ;............... ................fpm Feet per second....... ....... .......................... .... ..............."........... .......................................fps Foot... ............ ... ..... ..... ...... ............................. ........................................... ........ _............ ft Foot-pound..................... ....................... '..................................1......................................ft-lb Foot-pound-second (system)............':.............. .... ............ _____:.................... ..... .......... fps Freezing point___________ __ ___________..;;.____ ___ ________________________ _fp Gallon........ ................................................................................. ... ......... ..... ..................gal Gallons per minute............... ;..... J:.... ;.....................................-............. ....... ,,............. -gpm Gallons persecond'...........................-............ ............ -....... .'........ -............................ ... gps Gram.............................. ............................. ....................................... ... 1.............................. g Gram-calorie......... ....... ..........................................................................'....... _..... ........ g-cal Horsepower............ ......................... hp Horsepower-hour.--..................... ........... .............. .".L........... ......................................._hp-hr Hour....................... --.......................... ................ ............ :..................................... ... ;....... hr Inch................. ........... ................ ..... ........................................ ....... ........... ............ ,... .....in. Inch-pound.... .......... .--............................................... :.........................1................ ........ in.-lb Indicated horsepower........................................ ;............ ..................................................ihp Indicated horsepower-hour.--............................ ....................:.......................... .... ..... ihp-hr Kilogram.......... .........................:................ .............. ;...... ................................. ;...... .. ..... kg Kilowatt................:....... ,........................................................ ............................................kw Kilowatthour.................................................................................................................... kwhr Mass.--..................................................................... ,............................................... ..... mass Melting point..... ......... _mp Meter....... ........................................... m Micron....... ........... ...... .................................................. ;............................................. ^ (mu) Miles per hour.--................................... ...................... :........ .... :........ :..................... imph Millimeter.-.................................. ........................................... ;..................................... ... mm Minute.--......................................T.................................................. ;...................... ..... .... min Molecular weight............................................................................................. ;_____ mol. wt Mol.--................................................................................................................ ;.... ........ jjnol Ounce.............!.......................................................................................................... I.....___oz Pound................................ `........ t........ ........ ;.................................... ................................. lb Pounds pr square inch............................. ;...................................... ........... ............. ___ psi Pounds per square inch, gage...... Pounds per square inch, absolute. Revolutions per minute................ Revolutions per second................ Second..^....................................... -PS`g ..psia .jpm ....rps 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 3. Additional symbols and variations in the standard `Letter Symbols, for Mechanics of Solid -Bodies. ZtO.3-1942, and-Letter Symbols for Heat and Thermo dynamics, Z10.4-1943 {American Standards Association). Abbreviations and Symbols - ________ ::---------=------ 11 symbols found necessary in the individual chapters will be found in a list at the end of Chapters 3, 4, 5, 7, .39, 41, and 43. Acceleration, due to gravity............... .............. ............................................................ ---------- Acceleration, linear:----------------- ->............1............................-*...........:............................r-----a Area................................................ --: -..................... .................................................... A Change in specific volume during vaporization ...... ..................................... ------ *fg Density, Weight per unit volume* Specific weight.......................................... .d or p (rho) Distance, linear....... ..........................-.............................................-..................................... s Dry saturated vapor, Dry saturated gas at saturation pressure and temperature, vapor in contact with liquid...... .......... ........................................-.............. Subscript g Efficiency..........- -.......... -......................................-.......................... ---...........................*3 Elevation above some datum...................J...... .................................................. 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)------------ --........ .................r--............................ -..................................S or s Force, total load--!..................... -................... *......................................................................F Gas Constant, in equation pV -- nRT..................................................... -.... ................... R Head__ 1_____ ----------------- 1.....................................- --- - ................. ...............-...... H or k Heat content, Total heat, Enthalpy. (The capital should be used for any weight and the small letter for unit weight)..J............ ............. ..........................or h Heat content of saturated liquid, Total heat of saturated liquid, Enthalpy of saturated liquid, sometimes called heat of the liquid....................................... --M Heat content of dry saturated vapor, Total heat of dry saturated vapor, Enthalpy of dry saturated vapor..................................................................................................hg Heat of vaporization at constant pressure.:____________________________ ___^...L or h(g Hydraulic radius................................. ..... ....................................-................. ............ '..:...Ra Internal energy, Intrinsic energy. (The capital should be used for any weight and the small letter for unit weight)________ ________ :............. -...........................V or u Length of path of heat flow, .thickness............................. ....... ..... ......................:----- :----- L r .*'*' - ' Load, totalJ.........--....... ......... ....... .............................................................~~W Mechanical efficiency.________ ___:.......... ...... ............. J.................... .-......... -............ :-----Cm Mechanical equivalent of heat....... ................... ............................................ ........ ...... Power, Horsepower, Work per unit time________ _____ --........ .....................i--..... ---P Pressure, Absolute pressure, Gage pressure, Force per unit'area__ ' --i.----...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.......................... ........................ ......... ..............................................~iVRe Saturated liquid at saturation* pressure and temperature, Liquid in -contact with vapor__ ::_______ ___________ _____ ____ Subscript f Specific heat__________________^...__________ j....... .......................... '.....______ ^...c. Specific heat at constant pressure.............. ....... ......... ........ .................. ...... ....................^p. . 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. (CapitaU/ns/a is used preferably, only when small theta is used for ordinary, temperature)--.!__ ___ _____ ...T or (capital theta) .