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Консультация № 108461
07.11.2007, 18:57
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В сферической колбе вместимостью V=3л, содержащей азот, создан вакуум с давлением р=80 мкПа. Температура газа T=250 К. Можно ли считать вакуум в колбе высоким?
Обсуждение
12.11.2007, 08:51
общий
это ответ
Здравствуйте, Kurban!
Никто не отвечает, а срок поджимает. Грубая прикидка: при нормальных условиях - т-ре 273 К и давл-и 10^5 Па объём 1 моля газа 22.4 л. При заданных условиях в колбе находится: 3/22.4*273/250*80*10^-6/10^5 = 10^-10 моля (грубо). Умножаем на число Авогадро 6*10^23 и получаем, что в колбе 6*10^13 молекул азота, или 2*10^13 молекул азота на литр, или 20 миллионов молекул азота на 1 кубический миллиметр. Высоким считается вакуум, если молекула может пролететь всё отведённое пространство, ни разу не налетев на другую молекулу. Ясно, что в данном случае об этом и речи быть не может; и считать больше незачем.
Никто не отвечает, а срок поджимает. Грубая прикидка: при нормальных условиях - т-ре 273 К и давл-и 10^5 Па объём 1 моля газа 22.4 л. При заданных условиях в колбе находится: 3/22.4*273/250*80*10^-6/10^5 = 10^-10 моля (грубо). Умножаем на число Авогадро 6*10^23 и получаем, что в колбе 6*10^13 молекул азота, или 2*10^13 молекул азота на литр, или 20 миллионов молекул азота на 1 кубический миллиметр. Высоким считается вакуум, если молекула может пролететь всё отведённое пространство, ни разу не налетев на другую молекулу. Ясно, что в данном случае об этом и речи быть не может; и считать больше незачем.
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