You asked: Why do divers use helium?

At what depth do divers use helium?

Commercial and exotic gases

This mixture of helium and oxygen can be used at depths of up to 984 feet (300 m). Any deeper than that requires divers to replace helium with hydrogen. Helium becomes narcotic at these depths, and the body becomes susceptible to High Pressure Nervous Syndrome (HPNS).

Why regular air Cannot be used in divers tank?

Because our body needs it for its metabolic function, the air in a SCUBA tank cannot be devoid of oxygen. But oxygen does have toxic effects on the body when it is subjected to higher levels of pressure, specifically the central nervous system, pulmonary function, and ocular function.

How does helium help in bends?

Helium is used to dilute the oxygen and nitrogen to reduce these affects. … Also, Helium is much lighter than Nitrogen and bleeds out from the tissues that much faster and its use reduces decompression times. Helium there is less chance of getting the bends (originally called caissons disease).

Why do deep sea divers wear special suits?

As the depth of the sea increases, the pressure increases since pressure increases with depth. The pressure exerted by water deep under the sea is much greater than at the sea level. Hence, the deep sea divers wear special suits which protect them from extreme pressure of water. These suits are called diving suits.

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Why don t scuba divers fill their tanks with pure oxygen?

Diving with pure oxygen deeper than 20 feet can cause a person to absorb more oxygen than his system can safely handle, leading to central nervous system (CNS) oxygen toxicity. CNS oxygen toxicity causes a diver to go into convulsions (among other things).

Can you breathe pure oxygen?

Oxygen radicals harm the fats, protein and DNA in your body. This damages your eyes so you can’t see properly, and your lungs, so you can’t breathe normally. So breathing pure oxygen is quite dangerous.

Why are tanks diluted with helium?

Air contains a large amount of nitrogen and the solubility of gases in liquids increases with increase in pressure. Therefore, air in oxygen cylinders used for diving is diluted with helium gas. … This is done as He is sparingly less soluble in blood.

What does the Benz mean when diving?

Decompression sickness: Often called “the bends,” decompression sickness happens when a scuba diver ascends too quickly. Divers breathe compressed air that contains nitrogen. At higher pressure under water, the nitrogen gas goes into the body’s tissues.

Why don t scuba divers lungs collapse as they descend?

If divers descend without scuba gear, the amount of gas contained in their body cavities is constant and the volume of these cavities decreases as the surrounding water pressure becomes greater. However, … If they don’t, the pressure of the air in their lungs will cause their lungs to expand.

Why do scuba divers have to come up slowly?

Nitrogen in a diver’s body will expand most quickly during the final ascent, and allowing his body additional time to eliminate this nitrogen will further reduce the diver’s risk of decompression sickness. … Divers should slowly ascend from all dives to avoid decompression sickness and AGE.

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