| Réaumur | Centi- grade | Fahren- heit | |
|---|---|---|---|
| 80 | 100 | 212 | Water boils at sea-level |
| 76 | 95 | 203 | |
| 72 | 90 | 194 | |
| 68 | 85 | 185 | |
| 63.1 | 78.9 | 174 | Alcohol boils |
| 60 | 75 | 167 | |
| 56 | 70 | 158 | |
| 52 | 65 | 149 | White of egg coagulates |
| 48 | 60 | 140 | |
| 44 | 55 | 131 | |
| 42.2 | 52.8 | 127 | |
| 40 | 50 | 122 | |
| 36 | 45 | 113 | Tallow melts |
| 33.8 | 42.2 | 108 | |
| 32 | 40 | 104 | |
| 29.3 | 36.7 | 98 | Blood heat |
| 28 | 35 | 95 | |
| 25.8 | 32.2 | 90 | |
| 24 | 30 | 86 | |
| 21.3 | 26.7 | 80 | |
| 20 | 25 | 77 | |
| 16 | 20 | 68 | Temperate |
| 12.4 | 15.3 | 60 | |
| 10.2 | 12.8 | 55 | |
| 8 | 10 | 50 | |
| 5.8 | 7.2 | 45 | |
| 4 | 5 | 41 | |
| 1.3 | 1.7 | 35 | |
| 0 | 0 | 32 | Water freezes |
| 0.9 | - 1.1 | 30 | |
| 4 | - 9 | 23 | |
| 5.3 | - 6.7 | 20 | |
| 8 | -10 | 14 | |
| 9.8 | -12.2 | 10 | |
| 12 | -15 | 5 | |
| 14.2 | -17.8 | 0 | Zero Fahr. |
| 16 | -20 | - 4 | |
| 20 | -25 | -13 | |
| 24 | -30 | -22 | |
| 28 | -35 | -31 | |
| 32 | -40 | -40 | Mercury freezes |
To change from centigrade to Fahrenheit multiply by 9, divide by 5, and add 32. To change from Réaumur to Fahrenheit, multiply by 9, divide by 4, and add 32.
(Courtesy The World Almanac)
WEIGHTS AND MEASURES
THE METRIC SYSTEM
- Multiples which are used equally
with all the principal units
- M (myria = 10000)
- K (kilo = 1000)
- H (hekto = 100)
- D (deka = 10)
(NOTE. These are Greek numerals)
- Divisions which are used equally
with all the principle units
- d (deci = .1)
- c (centi = .01)
- m (milli = .001)
(NOTE. These are Latin numerals)
| Kinds of Quantities Measured | Principal Units | Definitions |
|---|---|---|
| Length | m (meter) | |
| Area | sq. m (square meter) | |
| a (Ar) | 1 sq. Dm. | |
| Volume | cu m (cubic meter) | |
| s (ster) | 1 cu. m. | |
| l (liter) | 1 cu. d m | |
| Weight | g (gram) | Weight of 1 cu. cm. of pure water at 4° centigrade |