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1 Tabla de conversion de unidades
1.1 Longitud
1 in = 2,54 cm
1 ft = 30,48 cm
1 ft = 12 in
1 cm = 0,3937 in
1 μ = 10 −^6 m
falta 1 = 10 −^8 cm
1.2 Masa
1 lb = 0,4536 kg
1 kg = 2,205 lb
1 Tn = 2205 lb
1.3 Temperatura
◦C
◦F − 32
180 =^
K − 273
R =◦^ F + 460
1.4 Super cie
1 in^2 = 6,452 cm^2
1 in^2 = 0,006944 f t^2
1 m^2 = 10,76 f t^2
1 m^2 = 1550 in^2
1 f t^2 = 144 in^2
1 f t^2 = 0,0929 m^2
1.5 Fuerza
1 Kg⃗ = 9,807 kg.m s^2 1 Kg⃗ = 9,807 N
1 dina = 1 gr.cm s^2
1 N = 1 kg.m s^2 1 lb⃗ = 4,448 N
1.6 Caudal másico
kg min
lb s
1 lb h = 1,260 × 10 −^4 kg s
1.7 Caudal volumétrico
1 lt min = 5,886 × 10 −^4 f t
3 s
1 f t
3 min = 4,720 × 10 −^4 m
3 s
1 U.S.gal min = 6,308^ ×^10
− 5 m 3 s
1.8 Volumen
1 f t^3 = 1728 in^3 1 f t^3 = 2,832 × 10 −^2 m^3 1 in^3 = 16,37 cm^3 1 lt = 0,03531 f t^3 1 cm^3 = 0,06102 in^3 1 U.S.gal = 3,785 × 10 −^3 m^3
1.9 Densidad
1 gr lt = 1000 p.p.m.
gr cm^3
lb f t^3
1 gr cm^3
lb in^3
1 lb f t^3
gr cm^3
1 lb f t^3
kg m^3
1 lb in^3 = 27,^
gr cm^3
1 lb in^3 = 1728 lb f t^3
1 kg m^3
lb f t^3
1.10 Velocidad
f t min
cm s
1 m s
f t s
1.11 Presion
1 atm = 14,696 psi ( lb/in⃗^2 ) 1 atm = 760 mm Hg 1 atm = 1,0333 (kg/cm⃗^2 ) 1 atm = 1,013 × 105 Pa = 101,3 kPa 1 bar = 1× 105 Pa
1 bar = 1.01972 (kg/cm⃗^2 )
1 Torr = 1,333 × 102 Pa
1 mm H 2 O = 9,807 Pa
1 ( kg/cm⃗^2 ) = 14,233 psi (lb/in⃗^2 )
1 ( kg/cm⃗^2 ) = 28,96 in de Hg
1 ( kg/cm⃗^2 ) = 2,048 (⃗lb/f t^2 )
1 ( kg/cm⃗^2 ) = 9,807 × 104 Pa
1.12 Potencia
1 HP =0,7457 kW = 7,457 × 102 W
1 HP = 550 ( lb.f t/s⃗ )
1 HP = 76,04 (kg.m/s⃗ )
1 BTU/s = 1,055 kW = 1,055 × 103 W
1 CV = 75 ( kg.m/s⃗ )
1 CV = 7,355 × 102 W
1.13 Viscosidad
1 Poise = 1(gr/cm.s) = 10 −^1 (N.s/m^2 )
1 Stoke = 1 (cm^2 /s)
1 centipoise = 2,42 (lb/h.f t)
1 centipoise = 3,60 (kg/h.m)
1 (lb/s.f t) = 1,488 (N.s/m^2 )
1.14 Conductividad térmica
1 (BT U/h.f t ◦F ) = 1,49 (kcal/h.m.◦C)
1 (cal/s.cm ◦C) = 2903 (BT U/h.f t^2 ◦F/in)
1 (kcal/h.m ◦C) =1,163 (W/m K)
1.15 Cte Stefan-Boltzmann
σ = 0,173 × 10 −^8 (BT U/h.f t^2 ) R^4
σ = 4,92 × 10 −^8 (kcal/h.m^2 ) K^4
σ = 5,71 × 10 −^5 (ergio/cm^2 .s) K^4
σ = 5,67 × 10 −^8 (W/m^2 ) K^4
1.16 Factor de conversión
gc = 9,81 (kg.m/⃗kg.s^2 ) = =32,2 (lb.f t/⃗lb.s^2 )
1.17 Energía, trabajo y calor
1 BTU = 0,252 kcal 1 BTU = 10,41 lt.atm 1 BTU = 3,93× 10 −^4 HP.h 1 BTU = 2,93 × 10 −^4 kW.h 1 BTU = 7,7816 × 102 (⃗lb.f t) 1 BTU = 1,055 × 103 J 1 BTU = 1,0758 × 102 (kg.m⃗ ) 1 kcal = 41,29 lt.atm 1 kcal = 1,558 × 10 −^3 HP.h 1 kcal = 1,162 × 10 −^3 kW.h 1 kcal = 3,086 × 10 −^3 ⃗lb.f t 1 kcal = 426,7 kg.m⃗ 1 kcal = 4187 J = 4187 N.m
1.18 Calor especi co
1 kcal/kg ◦C = 1 BTU/lb ◦F 1 kcal/kmol ◦C = 1 BTU/lbmol ◦F 1 BTU/lb K = 2,326 kJ/kg K 1 kcal/kg K = 1 BTU/lb R 1 kcal/kg ◦C = 4,187 kJ/kg K
1.19 Coef. Transferencia de calor
1 BTU/h.f t^2 ◦F = 4,88 (kcal/h.m^2 ) ◦C 1 BTU/h.f t^2 ◦F = 5,678 (W/m^2 ) K 1 kcal/h.m^2 ◦C= 1,163 (W/m^2 ) K
1.20 Cte. Universal de los gases
R = 0,08205 (lt.atm/gmol) K
R = 0,
kg.lt cm^2 .gmol.K
R = 10,
lb.f t^3 in^2 .lbmol.R R = 8315 (J/K.kgmol)
1.21 Agregado
N° Avogadro = 6 , 02214076 × 1023 1 Mol de sustancia = 6 , 02214076 × 1023 Unidades elementales 1 Mol de gas ideal ocupa un V de 22,4 l a 0 ◦C de T y 1 atm de P; y 22,7 l si P es de 1 bar (0, atm). El número n de moles de átomos n = m Mr
m=masa sustancia , Mr =masa molecular
