appendix A
Conversion Units and Scales
Photograph by Professor Michael Peres, Biomedical Photographic Communications, Rochester Institute of Technology.
Conversion Units
Illuminance
| Footcandle | Metercandle (lux) |
| 1 | 10.76 |
| 0.0929 | 0 |
Luminace
| Cd/square foot | Cd/square meter |
| 1 | 10.76 |
| 0.0929 | 0 |
Fahrenheit, Celsius, and Kelvin Temperature Scales
| F | C | K | |
| 9440° | 5230° | 5500 | Photographic daylight |
| 5300° | 2930° | 3200 | Photographic studio lamps |
| 2780° | 1530° | 1 800 | Candlelight |
| 1340° | 727° | 1000 | Minimum for blackbody emission of light |
| 212° | 100° | 373 | Boiling point of water |
| 98.6° | 37° | 310 | Body temperature |
| 68° | 20° | 293 | Typical film development |
| 32° | 0° | 273 | Freezing point of water |
| 0° | -178° | 255 | Zero Fahrenheit |
| -459° | -273° | 0 | Absolute zero |
To change F to C:
To change C to F:
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