Environmental Engineering Reference
In-Depth Information
1 acre =
4047.0
m
2
Calorie or mechanical equi
valence of
1 cal =
4.1868
J
heat
Density
1 lbm/ft
3
=
16.01846
kg/m
3
1 slug/ft
3
=
515.379
kg/m
3
Ener
gy
1 Btu =
1055.0
J
1 kW·h =
3600.0
kJ
1 ft·lbf =
1.35582
J
1 kcal =
4.1868
kJ
1 kg
m =
9.80665
J
f
F
orce
1 lbf =
4.448
N
1 kgf =
9.80665
N
1 dyne =
10
-5
N
Heat fl
ux
1 Btu/h· ft
2
=
3.154
W/m
2
1 kcal/m
2
·h =
1.163
W/m
2
Heat transfer coef
ficient
1 Btu/h·ft
2
˚F =
5.6786
W/m
2
K
1 kcal/m
2
h˚C =
1.163
W/m
2
K
Heat transfer rate
Same as po
wer
Kinetic viscosity(
ν
),
1 stokes =
1.0
×
10
-4
m
2
/s
thermal diffusivity (α ),
1 ft
2
/s =
0.0929
m
2
/s
mass diffusivity (
D
)
1 ft
2
/h =
2.581 × 10
-5
m
2
/s
Heat content, latent heat,
1 kcal/kg =
4.1868
kJ/kg
specific energy, specific
1 Btu/lbm =
2.326
kJ/kg
enthalpy, etc.
Length
1 in =
2.54 × 10
-2
m
1 ft =
0.3048
m
1 yd =
0.9144
m
1 mile =
1.609 × 10
3
m
Mass
1 lbm =
0.4536
kg
1 U.S.ton =
907.19
kg
1 ton =
1000.0
kg
1 oz =
28.35 × 10
-3
kg
Mass transfer coefficient
1 ft/h =
8.467 × 10
-5
m/s
Power
1 PS =
735.4988
W
1 kcal/h =
1.163
W
1 Btu/h =
0.293
W
1 hp =
745.7
W
1 PS =
0.98632
hp
Pressure, stress
1 Pa =
1
N/m
2
1 psi =
6895
Pa
1 atm =
1.013 × 10
5
Pa
1 bar =
1.000 × 10
5
Pa
1 torr = mmHg =
133.32
Pa
1 mmAq = 1 mmH
2
O =
9.80665
Pa
1 ftH
2
O =
2989
Pa
Specific heat, specific entropy
1 Btu/lbm·˚F =
4.188
kJ/kgK
1 kcal/kg·˚C =
4.182
kJ/kgK
Speed
1 mi/h =
0.447
m/s
1 km/h =
0.278
m/s
Temperature
1˚C =
1.0
K
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