Machinery's Handbook, 31st Edition
2828
Standard ABBREVIATIONS Abbreviations for Scientific and Engineering Terms ANSI/ASME Y14.38-2007 (R2013) ANSI/ASME Y14.38-2007 (R2013) (Continued)
lb f · ft or lb-ft lb f · in or lb-in lb f /ft 2 or psf lb f /in 2 or psi lb/hp or php
Indicated horsepower-hour Intermediate pressure Kilovolt-ampere hour Kilowatt-hour meter Least common multiple Internal Latitude Logarithm (common) Logarithm (natural) Low pressure Lumen per watt Magnetomotive force Mathematics (ical) Mean effective pressure Liquid Maximum
iph
Pound-force foot Pound-force inch
ip
intl
Pound-force per square foot
KVA-h or kVah Pound-force per square inch
kwhm
Pound per horsepower
lat lcm liq log
Power factor
pf qt
Quart
Reactive volt-ampere meter Revolution per minute Revolution per second Root mean square
rva
r/min or rpm r/s or rps
ln lp
rms rnd sec
lm/W or lpw Round
mmf math max mep mp m mks μ F
Secant Second Sine
s or sec
sin sp gr sp ht
Specific gravity Specific heat Square centimeter Square
Melting point
Meter
sq
Meter-kilogram-second (system)
cm 2 or sq cm ft 2 or sq ft in 2 or sq in km 2 or sq km
Microfarad
Square foot Square inch
Mile
mi
Mile per hour Milliampere Minimum Molecular weight
mi/h or mph
Square kilometer Square root of mean square
mA min
rms std tan temp
Standard Tangent Temperature Tensile strength Versed sine
mol wt
Molecule
mo NEC oz-in oz
National Electrical Code
ts V W
Ounce
vers
Ounce-inch Pennyweight
Volt Watt
dwt pot pd pt
Pint
Watt-hour
Wh wk wt
Potential
Week Weight Yard
Potential difference
Pound yd Alternative abbreviations conforming to the practice of the International Electrotechnical Commission. Ampere A Kilovolt-ampere kVA Microfarad μ F Ampere-hour Ah Kilowatt kW Microwatt μ W Volt V Coulomb C Milliampere mA Volt-ampere VA Farad F Kilowatt-hour kWh Millifarad mF Volt-coulomb VC Henry H Megawatt MW Millihenry mH Watt W Joule J Megaohm M Ω Millivolt mV Watthour Wh Kilovolt kV Microampere μ A Ohm Ω lb Only the most commonly used terms have been included. These forms are recommended for those whose familiarity with the terms used makes possible a maximum of abbreviations. For others, less contracted combinations made up from this list may be used. For example, the list gives the abbreviation of the term “feet per second” as “fps.” To some, however, ft per sec will be more easily understood. Abbreviations should be used sparingly and only where their meaning will be clear. If there is any doubt, then spell out the term or unit of measurement. The following points are good practice when preparing engineering documentation. Terms denoting units of measurement should be abbreviated in text only when preceded by the amounts indicated in numerals: “several inches,” “one inch,” “12 in.” A sentence should not begin with a numeral followed by an abbreviation. The use of conventional signs for abbreviations in text should be avoided: use “lb,” not “#” or “in,” not ″ . Symbols for the chemical elements are listed in the table on page 368 .
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