6 Answers

  1. Since the Earth's atmosphere is fairly well mixed, there is no noticeable decrease in the amount of oxygen in different places. In addition, the human body is able to adapt to an insufficient amount of oxygen (for example, already at an altitude of 1000 meters, the pressure is already 670 mmHg), increasing the depth and frequency of breathing.

    It's not the oxygen concentration that matters, but the carbon dioxide concentration. An increase in the proportion of carbon dioxide dissolved in the blood leads to a decrease in the proportion of oxygen. In cold winter conditions and a primitive window ventilation system, it is necessary to ventilate the room much less often, which leads to very high concentrations of carbon dioxide in the premises (2-5 times higher than on the street). Such living conditions, if you leave the house a little, lead to constant drowsiness and even headaches. The correct ventilation mode (every 4 hours) is possible only with good heating, since proper ventilation is usually accompanied by a decrease in the room temperature by 2-3 degrees (respectively, the room should warm up by these 2 degrees in 4 hours).

  2. The concentration of oxygen is almost unchanged, but the concentration of carbon dioxide in the northern hemisphere in winter increases by about 15 ppm from the summer minimum. It is the high concentration of carbon dioxide that could lead to drowsiness, but this requires a concentration of more than 1000 ppm, while normally less than 500 ppm in the fresh air. Therefore, an extra 15 ppm is not a serious problem (with modern climate change, the average concentration of carbon dioxide increases by 15 ppm in 10 years, so 10 years ago in winter, the concentration of carbon dioxide was the same as it is now in summer).
    What can affect sleepiness?
    First, all the same carbon dioxide, but in poorly ventilated areas. If you keep the windows open in summer and close them tightly in winter (and it's really good to close them so that there is no wind anywhere), then very quickly the concentration of carbon dioxide will exceed the comfortable values. This can lead to drowsiness, loss of the ability to concentrate on complex intellectual activities.
    Secondly, the length of daylight can also affect the fact that the body instinctively “goes into hibernation” (but here daylight lamps should deceive natural rhythms, but incandescent or warm LED lamps lead to drowsiness).

  3. there is always convection of air masses. from the level of 3000 m, you can feel the lack of oxygen in the air. at sea level, it is the norm for breathing,in the north, body heat loss requires rapid metabolism of the body and oxygen consumption increases to compensate for losses

  4. No, this is a misconception .there is no less or more oxygen .if this happens, humanity will end.cold compresses blood vessels because of this, blood circulation worsens, as a result, the exchange of oxygen in the blood slows down and worsens our activity in general and in the brain, too.

  5. The oxygen concentration becomes slightly higher. Without going into the gas laws, remember how the air expands when heated in balloons and they “float” in the atmosphere.

    And about blunt not blunt is the medical aspect let the doctors answer.

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