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½ð³æ (СÓÐÃûÆø)
- ·ÒëEPI: 31
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 784
- É¢½ð: 12
- ºì»¨: 3
- Ìû×Ó: 242
- ÔÚÏß: 40.5Сʱ
- ³æºÅ: 810298
- ×¢²á: 2009-07-16
- ÐÔ±ð: MM
- רҵ: Ö²Îï×ÊԴѧ
hcc1988(½ð±Ò+8, ·ÒëEPI+1):лл 2010-09-13 10:38:31
| There is such an elf,who guards a gate whit a little hole in a partition of a tin containing gas.When he sees high-speed moleculars from the left side,he will open the gate and let them go to right side.When he sees low-speed moleculars from the right side,he will open the gate and let them go to the left side.Supposing this gate is friciton-free,so the elf can make the high-speed moleculars assemble at the right and the low-speed moleculars assemble at the left without doing any work.As a result, the gas in the left becomes colder and colder, the gas in the right becomes hotter and hotter, which is agaist the second law of thermodynamics.People identify this elf as Maxcell demon. |

2Â¥2010-09-12 20:37:04













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