Blueprint Reading

ENERGY

FROM TO MULTIPLY BY

British thermal units (Btu) joules (J) 1055.1

calories (cal) joules (J) 4.1868

joules (J) kilocalories (kcal) 0.00023884

joules (J) calories (cal) 0.23884

joules (J) British thermal units (Btu) 0.0009478

joules (J) kilowatt hours (kW.h) 0.00000027778

kilocalories (kcal) joules (J) 4186.8

kilowatt hours (kW.h) joules (J) 3600000

AREA EQUIVALENTS

1 acre = 43,560 ft squared = 4840 yd^2 = 0.4047 hectares = 160 rods squared = 4047 m^2 =

0.0016 sq. mile

1 acre-inch = 102.8 m^3 = 27,154 gal = 3630 ft^3

1 hectare (ha) = 10,000 m^3 = 100 are = 2.471 acres = 107,639 ft squared

1 cubic foot (ft^3 ) = 1728 in^3 = 0.037 yd^3 = 0.02832 m^3 = 28,320 cm^3

1 square foot (ft^2 ) = 144 in^2 = 929.03 cm^2 = 0.09290 m^2

1 square yard (yd^2 ) = 9 ft^2 = 0.836 m^2

1 cubic yard (yd^3 ) = 27 ft^3 = 0.765 m^3

UNITS SQ. IN. SQ. FT. SQ YD. SQ. CM SQ. M

Sq. In. 1 0.006944 0.0007716 6.452 0.000645

Sq. Ft. 144 1 0.1111 929 0.0929

Sq Yd. 1296 9 1 8361 0.8361

Sq. cm 0.155 0.001076 0.0001196 1 0.0001

Sq. m 1550 10.76 1.196 10,000 1

342 Appendix 3