Volume, Density, Specific Weight, and Specific Gravity of an Object

Compiled by Dr. Clark Midkiff, Mechanical Engineering (revised 8/24/14 sawood)

ENGR103 Common Engineering Unit Conversion Factors

LENGTH 1 in = 2.54 cm = 0.0254 m

1 m = 3.2808 ft = 39.37 in = 100 cm = 1000 mm = 10 6 μm = 10

10 Angstrom

1 ft = 0.3048 m = 12 in = 30.48 cm = 0.33333 yd

1 km = 1000 m = 0.621 mi

1 mi = 5280 ft = 1760 yd = 1609.4 m

VOLUME 1 gal = 0.13368 ft 3 = 3.785 L = 4 qt = 8 pints = 16 cups = 256 Tbsp

1 L = 10 -3

m 3 = 10

3 cm

3 = 1.057 qt = 0.03531 ft

3

1 m 3 = 35.31 ft

3 = 1000 L = 264.1 gal = 1.308 yd

3

TIME 1 h = 60 min = 3600 s

1 yr = 52.14 wks = 365 days = 8760 h

MASS 1 kg = 1000 g = 2.2046 lbm = 35.27 oz. Av. = 0.068521 slug

1 lbm = 0.4536 kg = 453.6 g = 16 oz. Av. = 0.031081 slug

FORCE 1 N = 1 kg·m/s 2 = 0.2248 lbf = 10

5 dyn = 10

5 g·cm/s

2

1 lbf = 4.448 N = 4.448 x 10 5 dyn

gc gc = 1 = 1 kg·m/N·s 2 = 32.178 ft·lbm/lbf·s

2 = 1 ft·slug/lbf·s

2

ENERGY 1 J = 1 kg·m 2 /s

2 = 10

7 g·cm

2 /s

2 = 1 N·m = 0.7376 ft-lbf

1 Btu = 778.16 ft·lbf = 1.055 x 10 6 erga = 252 cal =1055.0 J

1 cal = 4.186 J = 3.088 ft·lbf

1 kcal = 4186 J = 1000 cal = 3.968 Btu

1 erg = 1 g·cm 2 /s

2 = 10

-7 J

1 Q = 10 18

Btu = 1.055 x 10 21

J = 10 3 Quad

1 kJ = 0.94781 Btu = 0.23884 kcal = 1kPa·m 3 = 6.242 x 10

21 eV

POWER 1 W = 1 kg·m 2 /s

3 = 1 J/s = 1 N·m/s = 3.412 Btu/h

1 hp = 550 ft·lbf/s = 33000 ft·lbf/min = 2545 Btu/h = 746 W

1 kW = 1000 W = 3412 Btu/h

PRESSURE 1 atm = 14.696 lbf/in 2 = 760 torr = 101325 Pa = 29.92 in Hg

1 mm Hg = 1 torr = 0.01934 lbf/in 2

1 bar = 10 5 Pa = 14.504 lbf/in

2 = 10

6 dyn/cm

2 = 0.98692 atm

1 Pa = 1 N/m 2 = 1 kg/m·s

2 = 1 J/m

3 = 1.4504 x 10

-4 lbf/in

2

1 lbf/in 2 = 1 psi = 6894.6 Pa = 2.0418 in Hg = 144 lbf/ft

2

1 in Hg = 3376.8 Pa = 0.4898 lbf/in 2 = 13.57 in H2O

1 in H2O = 248.8 Pa = 0.0361 lbf/in 2

POWER/AREA 1 W/m 2 = 0.3170 Btu/(h·ft

2 ) = 0.85984 kcal/(h·m

2 )

ENERGY/MASS 1 kJ/kg = 0.4299 Btu/lbm = 0.23884 kcal/kg

SPECIFIC HEAT 1 kJ/(kg·K) = 0.23884 Btu/(lbm·°R) = 0.23884 kcal/(kg·K)

1 Btu/(lbm·°R) = 4.186 kJ/(kg·K)

THERMAL CONDUCTIVITY 1 W/(m·K) = 0.5778 Btu/(h·ft·°R)

1 Btu/(h·ft·°R) = 1.731 W/(m·K)

CONVECTION 1 W/(m 2 ·K) = 0.1761 Btu/(h·ft

2 ·°R)

COEFFICIENT 1 Btu/(h·ft 2 ·°R) = 5.6782 W/(m

2 ·K)

DYNAMIC VISCOSITY 1 kg/(m·s) = 1 N·s/m 2 = 0.6720 lbm/(ft·s) = 10 Poise

TEMPERATURE (measured)

TEMPERATURE (change in properties)

°C = (°F - 32°)/1.8 °F = 1.8° C + 32° K = °C + 273 °R = °F + 460

1 °C = 1.8 °F , 1 K = 1 °C, 1°F = 1 °R therefore 1 K = 1.8 °R