Исправление greenman, (текущая версия) :
Видимо, такое понятие, как парциальное давление (именно оно играет роль при диффузии газов), ты успешно забыл.
Кстати, разумная мысль:
http://m.forums.theregister.co.uk/forum/containing/2474789
It so does leave a vacuum* behind! A sealed, air filled, hard disc drive will always have approximately the same pressure as the ambient air because the rate of inward diffusion matches the outward rate. In the case of a sealed, helium filled, drive there is almost no helium outside, but the helium atoms inside will move at a velocity determined by the ambient temperature and their random walks will lead some helium atoms outside. (See: Kinetic Theory of Gases). Far more Helium atoms will move out, than air molecules move in, because the air molecules are larger and are less likely to 'find' paths through the seal. I wouldn't expect a spectacular drop in pressure in 5 years, but I bet you could measure it with an unsophisticated manometer. *partial vacuum - to be precise. It's never going to reach a high vacuum! Mine's the one with the 'diffusion pump' in the long pocket.
Хотя... Вероятно проблема преувеличена. http://www.pro-vacuum.ru/vakuumnye-materialy/primenenie-metallov-dlia-vakuumn...
Исправление greenman, :
Видимо, такое понятие, как парциальное давление (именно оно играет роль при диффузии газов), ты успешно забыл.
Кстати, разумная мысль:
http://m.forums.theregister.co.uk/forum/containing/2474789
It so does leave a vacuum* behind! A sealed, air filled, hard disc drive will always have approximately the same pressure as the ambient air because the rate of inward diffusion matches the outward rate. In the case of a sealed, helium filled, drive there is almost no helium outside, but the helium atoms inside will move at a velocity determined by the ambient temperature and their random walks will lead some helium atoms outside. (See: Kinetic Theory of Gases). Far more Helium atoms will move out, than air molecules move in, because the air molecules are larger and are less likely to 'find' paths through the seal. I wouldn't expect a spectacular drop in pressure in 5 years, but I bet you could measure it with an unsophisticated manometer. *partial vacuum - to be precise. It's never going to reach a high vacuum! Mine's the one with the 'diffusion pump' in the long pocket.
Исходная версия greenman, :
Видимо, такое понятие, как парциальное давление (именно оно играет роль при диффузии газов), ты успешно забыл.
Кстати, разумная мысль:
http://m.forums.theregister.co.uk/forum/containing/2474426
It so does leave a vacuum* behind! A sealed, air filled, hard disc drive will always have approximately the same pressure as the ambient air because the rate of inward diffusion matches the outward rate. In the case of a sealed, helium filled, drive there is almost no helium outside, but the helium atoms inside will move at a velocity determined by the ambient temperature and their random walks will lead some helium atoms outside. (See: Kinetic Theory of Gases). Far more Helium atoms will move out, than air molecules move in, because the air molecules are larger and are less likely to 'find' paths through the seal. I wouldn't expect a spectacular drop in pressure in 5 years, but I bet you could measure it with an unsophisticated manometer. *partial vacuum - to be precise. It's never going to reach a high vacuum! Mine's the one with the 'diffusion pump' in the long pocket.