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 the boiling point of water, air temperature, and relative air density with altitude.
| Identifier | ExFiles\Box 87\1\ scan0097 | |
| Date | 24th September 1934 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 RELATIVE DENSITY. 1.00 .5 ALTITUDE IN FT. 2,000 4,000 6,000 8,000 10,000 RELATIVE AIR DENSITY. AIR TEMP. ALTITUDE IN FEET. 2000 4000 6000 8,000 10,000 | ||