Chart of Conversion Factors

Transcription

1 I/9, :2.l J(f)/t..4 Chart of Conversion Fators From English to Metri System and Metri to English System E Douments TTU li rary T U.S. Geologial Survey /Conservation Division USGS: INF-76-16

2 Chart of Conversion Fators Prefae Approximate Conversions The onversion fators in the following tables are for onversion of our ustomary (English) units of measurement tosi*units,and for onveniene, reiproals are shown for onverting Sl units bak to the English system. The first table ontains rule-of-thumb figures, useful for "getting the feel" of Sl units or mental estimation. The sueeding tables ontain fators aurate to 3 or more signifiant figures. Please. refer to known referene volumes for additional auray, as well as for fators dealing with other sientifi notation involving Sl units. * International System of Units (1) Multiply Ax 8 To Get D A B (2) Multiply D x C To Get A D inh (in) foot (ft) yard (yd) mile (mi) nautial mile square inh (in 2 ) square foot (ft 2 ) are (43560 ft2) gallon (US) barrel (42 gal) oune (oz) pound (lb av) short ton (2,000 lb) pound (mass)/foot (lb/ft) Example (1): Convert 6 inhes to entimeters 6(A) x 2.5(8) = 15 em (D) This same format is used throughout this metriation guide. The above onversion fators are derived from the following fators: entimeter (em) meter(m) meter (m) kilometer (km) kilometer (km) square entimeter (m 2 ) square meter (m 2 ) hetare (ha) (10,000 m 2 ) liter (L) ubi meter (m 3 ) gram (g) kilogram (kg) metri ton (t) kilogram/meter 1 inh (in) = 2.54 (exat) entimeters (em) 1 liter (L) = 1,000 ubi entimeters (m 3 ) 1 pound (lb) = kilograms (kg) Example (2): Convert 10 entimeters to inhes 10(0) x 0.4(C) = 4 in (A) Other Conversion Fators A B D of Units Commonly Used by the Conservation Division (Three or More Signifiant Figures) 2 Length inh (in) foot (ft) yard (yd) rod (16 2 ft) hain (66 ft) mile mile (nautial) entimeter (em) meter (m) meter (m) meter (m) meter (m) kilometer (km) kilometer (km) 3

3 A B D Area square inh (in 2 ) square entimeter (m 2 ) square foot (ft 2 ) square meter (m 2 ) square yard (yd 2 ) square meter {m 2 ) are (43560 ft 2 ) hetare. (ha) square mile (mi 2 ) square kilometer (km 2 ) setion (640 are) or square mile (mi 2 ) hetare (ha) Volume, Capaity ubi inh (in 3 ) ubi entimeter (m 3 ) ubi foot (ft 3 ) ubi meter (m 3 ) ubi yard (yd 3 ) ubi meter (m 3 ) ubi mile (mp) ubi kilometer (km 3 ) gallon (231 in 3 ) liter (L) barrel (42 US gal) ubi meters {m 3 ) are-foot 1, ubi meters (m 3 ) Mass (Weight) oune (av) gram (g) pound kilogram (kg) ton (US short) ton (t)* * 1 metri ton = 1,000 kilograms (kg) Mass/Length pound/ft (lb/ft) kilogram/meter (kg/m) Mass/Volume (Density, Conentration) pound/ubi ft {lb/ft 3 ) kilogram/ubi meter (kg/m 3 ) pound/gallon (US) kilogram/ubi meter (kg/m 3 ) pound/gallon (US) I gram/ubi entimeter {g/m 3 ) Volume/Time (Flow Rate) ubi ft/seond {ft 3 /s) ubi deimeter /se (dm 3 /s)* ubi ft/min {ft 3 /min) ubi deimeter/se (dm 3 /s) US gallon/minute ubi deimeter/se (dm 3 /s) barrel/day ubi deimeter/se (dm 3 /s) * 1 ubi deimeter (dm 3 ) = 1 liter (L), exatly. Heat, Calorifi Value British thermal unit (60 F) (Btu) joule (J) Calorie (20 C) joule (J) 4 5

4 A B D Heat, Calorifi Value-Continued Brit. ther. unit/lb (Btu/lb) Brit. ther. unit/gal (Btu/gal) Brit. ther. unit/ubi foot (Btu /fp) kilojoule/kilogram (kj/kg) kilojoule/ubi meter (kj/m 3 ) kilojoule/ubi meter (kj/m 3 ) Gas Oil Ratio ubi foot/barrel (fp/bbl) ubi meter/ubi meter(m 3 /m 3 ) Pressure pound/square inh (psi) pound/square inh (psi) kilogram/square entimeter (kg/m2) kilopasal (kpa)* * 1 kilopasal (kpa) = 1 newton per square meter (N/m 2 ) Temperature To onvert temperature in o Farenheit to oelsius, subtrat 32 and divide by 1.8. To onvert temperature in Celsius to o Fahrenheit, multiply by 1.8 and add 32. Footnote Multipliation Fators Prefix SISymbol In Sl pratie, number notation is made by separating digits into groups of three on either side of a deimal point, with a spae or half spae between groups. Amerian Petroleum Institute publiations show onversion fators in this manner, written as a number between one and ten with six or less deimal plaes. The number is followed by E (for exponent), a plus or minus symbol, and two digits whih indiate the power of 10 by whih the number must be multiplied to obtain the orret value. For example, E+, 03 is x 10 3 or In writing, Sl prefixes should be used to denote order of magnitude, as a substitute for writing powers of 10. Following is a hart of Sl prefixes: = = = = = = = = = = = = = = tera gig a mega kilo heto* deka* dei* enti* milli miro nano pi o femto atto T G M k h da d m }J n p f a *To be avoided where possible. 6 7

5 Notes 0\J.S. GOVERNMENT PRINTING OFFICE: /94