1 U. S. gallon equals 231 cubic inches; .1337 cubic foot; 8.333 pounds of water at 62° F.; 3.786 liters.

1 cubic inch of water at 62° F. equals .03608 pound; .5773 ounce; 252.6 grains; .004326 U. S. gallon; .01638 liter.

1 cubic foot of water at 62° F. equals 62.355 pounds; 997.68 ounces (about 1000); .557 cwt. (of 112 pounds); .0278 long ton; 7.4805 U. S. gallons; 28.315 liters; .02832 cubic meter.

1 cylindrical inch of water at 62° F. equals .02833 pound; .4533 ounce; .7854 cubic inch.

1 cylindrical foot of water at 62° F. equals 48.973 pounds (about 50); 783.57 ounces; .437 cwt. (of 112 pounds); .0219 long ton; 5.8758 U. S. gallons; 22.2380 liters; .02224 cubic meter.

1 cubic yard of water equals 1,684.8 pounds; 15.043 cwt. (of 112 pounds), or 15 cwt. 4.8 pounds; .7645 cubic meter.

1 liter of water equals 2.2046 pounds at 62° F.; .2641 U. S. gallon; 61.025 cubic inches; .0353 cubic foot.

1 cubic meter of water equals 1 metric ton, or 1,000 kilograms at 39.1° F. or 4° C.; 2,204.62 pounds at 39.1° F. or 4° ft; 2,203.7 pounds at 62.4 pounds per cubic foot; 1 ton of 2,240 pounds, nearly; 1 tun of 4 hogsheads, or 2,100 pounds, nearly; 264.2 U. S. gallons; 1.308 cubic yards; 35.3156 cubic feet; 1,000 liters.

The weight of fresh water is commonly assumed, in ordinary calculations, to be 62.4 pounds per cubic foot, which is the weight at 52.3° F. It is frequently taken as 62½ pounds or 1,000 ounces per cubic foot.

The volumes of given weights of water, at the rate of 62.4 pounds per cubic foot, are as follows:

1 ton (long), 35.90 cubic feet (about 36); 1 cwt. (of 112 pounds), 1.795 cubic feet; 1 pound, .016 cubic feet or 27.692 cubic inches; 1 ounce, 1.731 cubic inches; 1 metric ton, at 39.1° F. or 4° ft, 35.3156 cubic feet; 1 kilogram, at 39.1° F. or 4° ft, .0353 cubic feet or 61.025 cubic inches; 1 metric ton, at 52.3° F. (62.4 pounds per cubic foot), 35.330 cubic feet.

A pipe 1 yard in length holds about as many pounds of water at ordinary temperatures as the square of its diameter in inches (about two per cent. more).

A column of water at 62o F., 1 foot high, is equivalent to a pressure of .433 pound or 6.928 ounces per square inch of base; or to 62.355 pounds per square foot.

A column of water 1 inch high is equivalent to a pressure of .5773 ounce or .03608 pound per square inch; or to 5.196 pounds per square foot.

A column of water 100 feet high is equivalent to 43 1/3 pounds per square inch; or 2.786 tons per square foot.

A column of water 1 mile deep, weighing 62.4 pounds per cubic foot, is equivalent to a pressure of about 1 ton per square inch.

1 pound per square inch is equivalent to a column of water at 62° F. 2.31 feet or 27.72 inches high.

## Sea Water

1 cubic foot at 62° F., 64 pounds; 1 cubic yard, 15½ cwt., nearly (8 pounds less); 1 cubic meter, 1 long ton, fully (20 pounds more); 1 ton, 35 cubic feet.

Ratio of weight of fresh water to that of sea water, 39 to 40, or 1 to 1.028.

## Ice And Snow

1 cubic foot of ice at 32° F., 57.50 pounds; 1 pound of ice at 32° F., .0174 cubic foot, or 30.067 cubic inches; specific density of ice, .922; that of water at 62° F. being 1.