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PHỤ LỤC 2

HỆ ĐƠN VỊ SI

Base Units

M (meter), lengthA (ampere), currentMole or mol, substance Kg (kilogram), massK (kenvin), temperature s (second), timecd (candela), luminosity

Angular Measure

Rad = 1 deg = π 180 rad size 12{ { {π} over {"180"} } ital "rad"} {} Sr = 1.sr

Length

cm = 0.01.mft = 0.3048.mmi = 5280.ft km = 1000.min = 2.54.cm mm = 0.001.myd = 3.ft

Mass

gm = 0.001.kgmg = 0.001.gmoz = 1b 16 size 12{ { {1b} over {"16"} } } {} tonne = 1000.kgton = 2000.lb lb = 453.59237.gmslug = 32.174.lb

Time

min = 60.syr = 365.2422.day hr = 3600.s day = 24.hr

Area, Volume

hectare = 10000.m2mL = 0.001.L acre = 4840.yd2fl_oz = 29.57353.cm3 L = 0.001.m3gal = 128.fl_oz

Velocity, Acceleration

mph = mi hr size 12{ { { ital "mi"} over { ital "hr"} } } {} kph = km hr size 12{ { { ital "km"} over { ital "hr"} } } {} G = 9.80665. m s 2 size 12{ { {m} over {s rSup { size 8{2} } } } } {}

Force, Energy, Power

N = kg . m s 2 size 12{ ital "kg" "." { {m} over {s rSup { size 8{2} } } } } {} kgf = g.kgcal = 4.1868.JW = J s size 12{ { {J} over {s} } } {} dyne = 10 5 . N size 12{"10" rSup { size 8{ - 5} } "." N} {} J = N.mkcal = 1000.calkW = 1000.W lbf = g.lberg = 10 7 . J size 12{"10" rSup { size 8{ - 7} } "." J} {} BTU = 1 . 05506 . 10 3 . J size 12{1 "." "05506" "." "10" rSup { size 8{3} } "." J} {} hp = 550. ft . lbf s size 12{ { { ital "ft" "." ital "lbf"} over {s} } } {}

Pressure, Viscosity

Pa = N m 2 size 12{ { {N} over {m rSup { size 8{2} } } } } {} in_Hg = 3.37686.103.Papoise = 0.1.Pa.s psi = lbf in 2 size 12{ { { ital "lbf"} over { ital "in" rSup { size 8{2} } } } } {} torr = 1.33322.102.Pa atm = 1.01325.105.Pastokes = 10-4. m s size 12{ { {m} over {s} } } {}

Temperature

R = 0.556.K

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Source:  OpenStax, Bài giảng môn học mathcad. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10744/1.1
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