Environmental Engineering FOURTH EDITION

Appendix A

Conversion Factors

Multiply BY To obtain

acre
acre ft
atmospheres

British thermal units
Btdft3
Btu/lb
Btdb
Btu/s
Btu/ton
Btu/ton

calories

calories

ca

cdm3

calltonne

centimeters

0.404

1233

14.7

ha

m3

lb/in.*

252 Cal

8905 cdm3

2.32 JJg

0.555 cdg

1.054 x lo3 J

1.05 kW

278 calltonne

4.18

1.80

3.9 x 10-~

1.12 10-~

3.60 x 10-~

0.393

joules

Btu

Btu/lb

Btu/ton

in.

Btu/ft3

feet 0.305 m
Wmin 0.00508 m/S
WS 0.305 m/S
ft2 0.0929 m2
ft3 0.0283 m3
ft3 28.3 liters
ft3/s 0.0283 m3/s
ft3/s^449 gallmin
ft lb (force) 1.357 joules
ft lb (force) 1.357 newton meters

(continued)

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