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Cần gì đợi đến lúc có cháy
10 Jul, 2023
dùng lúc nào cũng được nhé,
ống thở đằng sau toilet phòng khi xảy ra cháy
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"Breathe sewer (cống rãnh) gas to survive the choking (ngột ngạt) fumes of a fire" is a dire option indeed, but this patented (môn bài) breathing tube (via Reddit) suggests dire circumstances.
Sewer gas is typically 20-200 ppm hydrogen sulfide and even at the upper range it's not going to do anything other than give you a sore throat (đau họng) and make it hard for you to smell anything else. Methane concentrations (cô cạn) are 7-15 ppm and breathing it at those concentrations for extended periods may make you feel lightheaded (mê sảng) and nauseous (nôn mửa), but it shouldn't kill you. Occupational (trong nghề nghiệp) exposure of 5300 ppm over eight hours in some industries is not uncommon. The rest of sewer gas composition is regular atmosphere.
The alternative atmosphere is a structure fire will render you unconscious (bất tỉnh) in 2-5 minutes. Breathing through the toilet obviously isn't ideal (lý tưởng), but you can do it for hours with no long term effects.
source: boingboing,
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