|Jun12-11, 12:24 AM||#1|
why every gas would exert zero pressure at -273.15 degree celsius
I was reading about the experiment of constant volume gas thermometer today. When we extrapolate the presuure -temperature lines, the lines would meet at point -273.15 degree celsius, which is zero presure. I was wondering whether it is a matter of coincidence or some science behind it. The lines could have intercepted at some non-zero pressure. Please help me understanding this.
|Jun12-11, 06:10 AM||#2|
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|Jun16-11, 12:58 AM||#3|
But, still, it is no coincidence. The absolute temperature scale is defined so that intersection occurs at 0 K (absolute zero). The celcius scale is defined by the triple point of water, I believe, and that gives 0 Celcius at 273.15 Kelvin. Thus, you measure absolute zero at -273.15 C.
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