Fig. 93.
Note.—The above figures are introduced to show more vividly the comparison between bulk and weight, the size of the different substances, of course, being merely approximate. A study of the Table of Specific Gravities to be found in the next page is worthy of the time and attention.
TABLE OF SPECIFIC GRAVITIES.
| Metals. | |||
|---|---|---|---|
| Iron, | (cast) | 7·207 | |
| „ | (wrought) | 7·688 | |
| Steel | (soft) | 7·780 | |
| „ | (tempered) | 7·840 | |
| Lead | (cast) | 11·400 | |
| „ | (sheet) | 11·407 | |
| Brass | (cast) | 8·384 | |
| „ | (wire drawn) | 8·544 | |
| Copper | (sheet) | 8·767 | |
| „ | (cast) | 8·607 | |
| Gold | (cast) | 19·238 | |
| „ | (hammered) | 19·361 | |
| Gold | (22 carats) | 17·481 | |
| „ | (20 „ ) | 15·709 | |
| Silver | (pure, cast) | 10·474 | |
| „ | (hammered) | 10·511 | |
| Mercury | (60°) | 13·580 | |
| Pewter | 7·248 | ||
| Tin | 7·293 | ||
| Zinc | (cast) | 7·215 | |
| Platinum | 21·500 | ||
| Antimony | 6·712 | ||
| Arsenic | 5·763 | ||
| Bronze | (gun metal) | 8·700 | |
| Stones and Earth. | |||
| Coal | (Bituminous) | 1·256 | |
| „ | (Anthracite) | { | 1·436 |
| 1·640 | |||
| Charcoal | ·441 | ||
| Brick | 1·900 | ||
| Clay | 1·930 | ||
| Common | Soil | 1·984 | |
| Emery | 4·000 | ||
| Glass | (plalte) | 3·248 | |
| Ivory | 1·822 | ||
| Grindstone | 2·143 | ||
| Diamond | 3·521 | ||
| Gypsum | 2·168 | ||
| Lime | 2·720 | ||
| Granite | 2·625 | ||
| Marble | 2·708 | ||
| Mica | 2·800 | ||
| Millstone | 2·484 | ||
| Nitre | 1·900 | ||
| Porcelain | 2·385 | ||
| Phosphorus | 1·770 | ||
| Pumice Stone | ·915 | ||
| Salt | 2·130 | ||
| Sand | 1·800 | ||
| Slate | 2·672 | ||
| Sulphur | 2·033 | ||
| Woods. | |||
| Ash | ·845 | ||
| Beech | ·852 | ||
| Birch | ·720 | ||
| Oak | 1·120 | ||
| Pine | (yellow) | ·660 | |
| „ | (white) | ·554 | |
| Cherry | ·715 | ||
| Cork | ·240 | ||
| Elm | ·671 | ||
| Poplar | ·383 | ||
| Walnut | ·671 | ||
| Willow | ·585 | ||
| Liquids. | |||
| Acid | Sulphuric | 1·851 | |
| „ | Muriatic | 1·200 | |
| Spirits | of Wine | ·917 | |
| Alcohol | ·790 | ||
| Oil | (turpentine) | ·870 | |
| „ | (olive) | ·915 | |
| Oil | (linseed) | ·932 | |
| „ | (castor) | ·961 | |
| Pure | water | 1·000 | |
| Vinegar | 1·080 | ||
| Milk | 1·032 | ||
| Sea water | 1·029 | ||
To Find the Weight of a Cubic Foot of Anything Contained in these Tables.
Rule. Multiply 62·5 lbs. (the weight of a cubic foot of pure water) by the specific gravity of the given body.
Example. What is the weight of a cubic foot of sea water?
62·5 lbs.
1·029 sp. gravity.
——–
5625
1250
625
———–
Answer, 64·3125 lbs. is the actual weight: but 64 lbs. is taken in practice as the weight of a cubic foot of sea water.