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At 12:43 PM 2/8/99 -0700, Jimmy L. Stanford wrote: > I don't know why a calibration manual would be so far off but STP is >defined as 273.15K which is freezing temp of H2O (0C or 32F). Pressure is >1.013x10^5 Pa or 1 ATM. This is the standard used in all Physics text. I >double checked it to make sure Snow & Shull Physics text page 374 and index >(both agree on same values). Hope this clears up some of the confusion. Standard temperature and pressure is different in different contexts. There is no one true standard. In aviation, for example, standard temperature is 59F and standard pressure is 29.92" or 1013mb. Same for meteorology, but in physics standard temperature is 273.15K or 0C, in human physiology, it's 98.6F, etc. A good standard has three qualities... it's easy to write, it's easy to use as a baseline reference, and it's a convenient magnitude in the context of the discipline in which it is used; so, volcanologists use a different standard temperature than biologists. This is as it should be. The weight you come up with for a given volume of air depends on the context. To be really precise, you have to indicate the volume, temperature, pressure, and even humidity before your calculated weight makes any sense. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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