TETAPAN FISIKA DAN EKUIVALEN BERDIMENSI

A.Tetapan Fisika yang Penting 

Bilangan avogadro                                NA = 6.022 045X10²⁶molekul /kg mol

Tetapan gas universal                             = 1545.35 ft-lbf/lbm-mol-^oR

                                                                     = 8314.41 J/kg mol-K

                                                                     = 1.986 Btu/lbm-mol- ^oR

                     = 1.986 kkal/lbm-mol-K

Tetapan planck                                          h = 6.626176 X 1Q^-34J

Tetapan boltzmann                                    k = 1.380662X 10^-23 J/molekul-K

                                                                      = 8.6173 X 10^-5 eV/molekul-K

Kecepatan cahaya dalam  hampa              c = 2.997 925 X 10⁸ m/det

Percepatan gravitasional standar               g = 32.174 ft/det²

                                                                      = 9.80665 m/det²

Massa elektron                                        me = 9.1095 X10^-31 kg

Muatan elektron                                         e = 1.602 189 X 10^-19 C

Tetapan stefan-boltzmann                          σ = 0.1714 X 10^-8 Btu/h-ft²-R⁴

                                                                      = 5.670 32 X 10⁸ W/m2-K⁴

 

B. Berbagai Ekuivalen Berdimensi

Panjang                                   I m = 3,2808 ft = 39,37 in

                                                1 cm = 10^-2 m = 0.394 in = 0,0328 ft

1 mm = 10^-3m

1 pm = 10^-6 m

1 A = 10^-10 m

1 km = 0,621 mil

1mi = 5280 ft

1 m2 = 10,76 ft²

Luas                                         1 cm2 =10^-4 m² = 0,155 in²

Volume                                    1 gal = 0,13368 ft3 = 3,785 liter

1 liter =10^-3 m³

Waktu                                      I h = 3600 s = 60 min

1 ms = 10^-3 s

I Ps = 10^-6 s

1 ns = 10^-9 s

Massa                                      1 kg = 1000g = 2,2046 lbm = 6,8521 X 10^-2 slug

I slug = 1 lbf●s²/ft = 32,174 lbm

Kakas                                      I N = I kg●m/s²

1 dyn = -1 g●cm/s²

I lbf = 4,448 X 105 dyn = 4,448 N

Energi                                      1 J = I kg-M2/S2

1 Btu = 778,16 ft●lbf = 1,055 X 10¹⁰ ergs = 252 kal = 1055,0 J

1 kal = 4,186 J

I kkal = 4186 J = 1000 kal

1 erg = 1 g●cm²/s² = 10^-7J

IeV = 1,602 X 10^-19 J

I Q = 1018 Btu = 1,055 X 1021 J

I Quad = 1015 Btu

Daya                                       I kJ = 0,947813 Btu = 0,23884 kkal

1 W = 1 kg●m2/s3 = 1 Js

1 hp – 550 ft●lbf/s

1 hp =2545 Btu/h= 746 W

1 kW-1000W = 3412 Btu/h

Tekanan                                   1 atm = 14,696 lbf/in2 =760 torr = 101325 N/m2

1 mm Hg = 0,01934 lbf/in2 = 1 torr

1 dyn/cm2 = 145, Tx 10-‘ lbf/in2

1 bar = 105 N/m2 = 14,504 lbf/in2 = 106 dyn/cm2

1 μ = 10^-6 m Hg = 10^-3 mm Hg

1 Pa = I N/m2 = 1,4504 X 10^-4 lbf/in2

1 in Hg = -3376,8 N/m2

1 in H20 = 248,8 N/m2

Daya persatuan luas                1 W/m2 = 0,3170 Btu/ (jam●ft2) = 0,85984 kkal/(jam●m2)

Koefisien perpindahan kalor   1 W/(m2●^oC) = 0,1761 Btu/(jam.ft●^oF) = 0,85984 kkal/(jam.m2●^oC)

Energi persatuan massa           I kJ/kg = 0,4299 Btu/lbm = 0,23884 kkal/kg

Kalor jenis                               1 kJ/(kg●^oC) = 0,23884 Btu/(lbm●^oF) = 0,23884 kkal/(kg●^oC)

Konduktivitas termal                      I W/(m●^oC) = 0,5778 Btu/(jam-ft-‘F) = 0,85984 kkal/(jam●m●^oC)


Sumber: Sulistiati, Ainie Khuriati Riza. 2010. Termodinamika. Graha Ilmu: Yogyakarta.