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| Cable length | In Verne’s context, 600 feet |
| Centigrade | 0° centigrade = freezing water |
| 37° centigrade = human body temperature | |
| 100° centigrade = boiling water | |
| Fathom | 6 feet |
| Gram | Roughly 1/28 of an ounce |
| . . . Milligram | Roughly 1/28,000 of an ounce |
| . . . Kilogram (kilo) | Roughly 2.2 pounds |
| Hectare | Roughly 2.5 acres |
| Knot | 1.15 miles per hour |
| League | In Verne’s context, 2.16 miles |
| Liter | Roughly 1 quart |
| Meter | Roughly 1 yard, 3 inches |
| . . . Millimeter | Roughly 1/25 of an inch |
| . . . Centimeter | Roughly 2/5 of an inch |
| . . . Decimeter | Roughly 4 inches |
| . . . Kilometer | Roughly 6/10 of a mile |
| . . . Myriameter | Roughly 6.2 miles |
| Ton, Metric | Roughly 2,200 pounds |