From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph showing the variation of boiling point of water, air temperature, relative air density, and power factor with altitude.
| Identifier | ExFiles\Box 149a\2\ scan0333 | |
| Date | 9th January 1936 guessed | |
| VARIATION OF BOILING POINT AIR TEMP AND RELATIVE AIR DENSITY WITH ALTITUDE BOILING POINT OF WATER 100 90 80 °C AIR TEMP. 20 10 0 -10 ALTITUDE IN FT. 2,000 4,000 6,000 8,000 10,000 RELATIVE AIR DENSITY POWER FACTOR AIR TEMP. POWER FACTOR 1.00 0.90 0.80 0.70 0.60 ALTITUDE IN FEET. RELATIVE DENSITY 1.00 .5 | ||