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As the diver ascends to the surface the external pressure decreases. If the air in the lungs were not exhaled, the volume in the thorax would expand, and the diver's lungs would explode.

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โˆ™ 2009-05-25 19:20:13
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Q: Why do scuba divers need to exhale when they ascend to the surface?
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Why do scuba divers need to exhale air when they ascend to the surface of the water?

Number one rule of Scuba diving is never ever hold your breath the pressure changes when you descend and ascend could damage your lungs. When ascending a diver does not need to just exhale they breathe normally unless they are using an emergency ascend in which case, depending on which emergency ascent they are using and for what reason, ie out of air and so on, will exhale on the way up to again ensure the pressure changes will not cause their lungs from over expansion and bursting I hope this helps


How do scuba divers rise to the surface after they dive?

Slowly


What happens to the volume of air in your lungs when you ascend to the surface of the ocean?

The air in your lungs expands in volume as you get closer to the surface of any water you swim in. This is because the air was compressed when deeper due to the pressure of the water around you. This is why when scuba divers always exhale while ascending to avoid rupturing their lungs as the air expands.


Do scuba divers breath pure oxygen?

Technical scuba divers do, but recreational divers do not.


What do scuba divers ditch first if they have to ascend in a hurry?

By Ditch I assume you mean discard or Jettison. obviously lead ballast which can get in the way!


What is the collective noun of scuba divers?

The collective noun is a bubble of scuba divers.


What cant scuba divers do at 33ft below the surface which others can?

breath without life support. :)


Who would use the scuba gear?

Scuba divers.


What do scuba divers do?

dive


Who can get bends?

scuba divers


Who uses a scuba-suit?

Many people use a SCUBA suit for diving. Sport divers, police divers and some Navy recovery divers.


How do scuba divers move?

They swim

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