Self-contained breathing apparatus pressure changes with ambient temperature. As temperature decreases, the pressure inside the cylinder decreases. The relationship between the temperature and the pressure of a gas is defined by the formula "PV" = "nRT". (See Universal gas constant.) What is particularly important to understand from the formula is that the temperature is in kelvins, not degrees Fahrenheit. Consider the freezing point of water at 32 °F (0 °C, 273.15 K) and compare it to 96 °F (35.6 °C or 308.71 K; normal human body temperature is 37 °C). While 96 is arithmetically three times 32, the difference in temperature from a
Centigrade 232 spell with Hawkwind from 1976 that he had become more recognised as being a singer and front-man of a rock band, but he continued actively writing poems and plays during this time. In 1977 a collection of his poems were compiled and published by Quasar books, the title being (allegedly) the temperature at which writing paper burns "signifying the writer destroying his rough drafts". This is an allusion to the Ray Bradbury novel "Fahrenheit 451" and possibly the film thereof, 451°F being equivalent to 232 Centigrade. Some of the poems are pieces he had performed with Hawkwind during the "Space