Weight of one cubic inch of Pure Water.
| At 32° F. | = ·03612 | pound, | or | 0·5779 | ounce. | |
| At 37°·1 | = ·036125 | „ | „ | 0·5780 | „ | |
| At 62° | = ·03608 | „ | „ | 0·5773 | „ | or 252·595 grains. |
| At 212° | = ·03451 | „ | „ | 0·5522 | „ |
The weight of one cylindrical inch of pure water at 62° F. is ·02833 pounds, or 0·4533 ounce.
Volume of one pound of Pure Water.
| At 32° F. | = ·016021 | cubic foot, | or | 27·684 | cubic inches. |
| At 39°·1 | = ·016019 | „ | „ | 27·680 | „ |
| At 62° | = ·016037 | „ | „ | 27·712 | „ |
| At 212° | = ·016770 | „ | „ | 28·978 | „ |
The volume of one ounce of pure water at 62° F. is 1·732 cubic inches.
The weight of water is usually taken in round numbers, for ordinary calculations, at 62·4 lbs. per cubic foot, which is the weight at 52°·3 F.; or it is taken at 621⁄2 lbs. per cubic foot.
Salt water boils at a higher temperature than fresh water owing to its greater density, and because the boiling point of water is increased by any substance that enters into chemical combination with it. The density of water decreases as the temperature increases, since heat destroys cohesion and expands the particles, causing them to occupy greater space, where precision is not required; the pressure on a square foot at different ocean depths are approximate, in the following
TABLE.
| Depth in feet. | Pressure on sq. foot. | |
|---|---|---|
| 8 | 500 | lbs. |
| 16 | 1000 | „ |
| 24 | 1500 | „ |
| 32 | 2000 | „ |
| 40 | 2500 | „ |
| 48 | 3000 | „ |
| 56 | 3500 | „ |
| 64 | 4000 | „ |
| 72 | 4500 | „ |
| 80 | 5000 | „ |
| 88 | 5500 | „ |
| 96 | 6000 | „ |
| 1 mile, or 5,280 feet, | 330,000 lbs. | |
| 5 miles, | 1,650,000 „ | |