Appendix A Conversion to SI units

Appendix A Conversion to SI Units

Physical quantity

Unit

SI ( M K S ) equivalent

Length

ft /xm

0.305 m 10 -6 m

nm

10 -9 m

day

8.64 • 104 s

Mass

lb

0.454 kg

Temperature

oF

273 + (~ - 32)/1.8 K

Volume

liter

10 -3 m 3

Velocity

mph knots km hr -1

Force

k g m s -2

Time

fps lb dyne Pressure

Energy

m s -1 m s -1 m s-1 m s-1

1N 0.138N 10 -5 N

Nm-2

1Pa

bar mb

105 Pa 102 Pa = 1 hPa

kg m 2 s -2 Nm erg cal

Power

0.447 0.515 0.278 0.305

kg m -2 s -3

1J 1J 10 .7 J 4.187 J

js-1 Langley day-

1W lW 4.84 x 10 -1 W m -2

Specific heat

cal g m -

4.184 x 103 J kg -1

E n e r g y flux

cal cm -2 min -1

6.97 x 102 W m -2

577