Скачать или смотреть Why helium is used in oxygen cylinder of scuba divers?

Helium is not typically used in oxygen cylinders for scuba diving. In scuba diving, the primary gas used for breathing underwater is compressed air, which consists of approximately 21% oxygen and 79% nitrogen. This mixture closely resembles the composition of the Earth's atmosphere.

However, helium is used in certain specialized diving scenarios, such as deep-sea or technical diving. In these cases, a different gas mixture called trimix may be used. Trimix combines helium, oxygen, and nitrogen in varying proportions depending on the depth and duration of the dive.

The addition of helium to the breathing gas mixture helps to reduce the amount of nitrogen in the mix. This is important for deep dives, where excessive nitrogen can lead to a condition known as nitrogen narcosis, which can impair judgment and cognitive function. By replacing some of the nitrogen with helium, divers can reduce the risk of nitrogen narcosis.

It's worth noting that oxygen cylinders, regardless of whether they contain compressed air or a specialized gas mixture, are typically made of high-strength steel or aluminum and are designed to handle the specific gas pressures and conditions required for scuba diving.