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 full recitation of the "Centigrade 232" collection. Other releases comprised recitations of the unpublished "Earth Ritual" poems collection and two music tapes, "Blueprints from the Cellar" Volumes 1 and 2, which contained home demos of songs, some of which would be released in completed form on the albums "Freq" and "Test Tube Conceived". Calvert's "Centigrade 232" tape recitation was first used with music on the second Spirits Burning album "Reflections in a Radio Shower", released in 2001. Don Falcone took the original recording of Calvert reading his poem "Centigrade 232" and integrated it into the track "Drive-By Poetry". Lines from