Breathing a mixture of helium and oxygen in a closed space like a plastic bag can be extremely dangerous and potentially life-threatening. Let me explain why:
Lack of Sufficient Oxygen: Helium is an inert gas that does not support respiration. While helium-oxygen mixtures are used in certain medical and diving applications, they are carefully controlled to ensure that sufficient oxygen is present. In a closed space, if the oxygen concentration becomes too low, you would be at risk of experiencing oxygen deprivation or hypoxia. This can lead to dizziness, confusion, loss of consciousness, and ultimately, if not addressed promptly, it can be fatal.
Accumulation of Carbon Dioxide (CO2): When you breathe, your body produces carbon dioxide as a waste product. Normally, your respiratory system removes carbon dioxide from your body and replaces it with oxygen. In a closed space with limited ventilation, the exhaled carbon dioxide would accumulate, leading to an increase in its concentration. Breathing in an elevated concentration of carbon dioxide can cause symptoms like headache, dizziness, shortness of breath, confusion, and, in severe cases, it can result in unconsciousness or even death.
Displacement of Oxygen: Helium is lighter than air, and if you breathe it in a closed space, it can displace the surrounding air, including oxygen. As a result, you may end up inhaling a high concentration of helium, which can lead to a lack of oxygen supply to your body, as helium does not effectively support respiration. This can quickly lead to oxygen deprivation and the symptoms associated with hypoxia.
In summary, breathing a mixture of helium and oxygen in a closed space like a plastic bag is extremely dangerous. It can lead to oxygen deprivation, accumulation of carbon dioxide, and a lack of sufficient oxygen supply to your body. The risks involved far outweigh any perceived benefits, making it a potentially life-threatening activity. It is crucial to prioritize safety and avoid engaging in such practices.