Why do divers exhale when surfacing?

Why do divers exhale when surfacing?

As the diver ascends, the air in the lungs expands as surrounding water pressure decreases. Exhaling allows excess volume to escape from the lungs, and by exhaling at a suitable rate the diver can continue exhaling throughout the ascent and still have air in his or her lungs at the surface.

What are the steps or process needed in diving task?

In-water procedures in this grouping include entry to the water, surface swimming, descent, buoyancy and trim control, equalisation of pressure in air spaces, maneuvering in midwater and at the bottom, monitoring the dive profile, gas supply and decompression obligations, normal ascent, and exit from the water.

What does CESA scuba mean?

Controlled Emergency Swimming Ascent
The Controlled Emergency Swimming Ascent (CESA) is one of the most complex skills in the Open Water Diver course. It’s also an important emergency procedure to learn.

What happens if you hold your breath scuba diving?

A diver holding their breath during an ascent risks air not escaping naturally. Air volume in their lung expands due to less pressure at shallower depths. Air has to escape and the diver’s lung is forced to break. This is a Lung Over Expansion Injury.

Why shouldn’t divers fly or take hot showers soon after deep dives?

b) The Reason why divers shouldn’t fly or take hot showers soon after deep dives is because when you go diving sometimes you get tiny air bubbles in your bloodstream. When you take a hot shower the temperature will increase the volume of the air bubbles which can cause decompression illness.

What are the 10 steps to scuba diving?

The top 10 safety tips for scuba diving include:

1. Never hold your breath.
2. Never without a buddy.
3. Ascend slowly from every dive.
4. Perform a safety stop at 5-6 metres (16-20 feet).
5. Plan your dive and dive the plan.
6. Know your limits and dive within your limitations.
7. Check your air contents gauge regularly.

What is SPG diving?

SPG in scuba diving stands for submersible pressure gauge. What is gauge pressure in scuba diving? Gauge pressure in scuba diving is the amount of air or breathable gas left in your scuba diving tank. A pressure gauge measures this gas/air in bar or psi.

What is MSW in diving?

The metre (or meter) sea water (msw) is a metric unit of pressure used in underwater diving. It is defined as one tenth of a bar.

What are the emergency procedures for an airplane?

(1) keeping vital structure (cockpit/cabin area) relatively intact by using dispensable structure (such as wings, landing gear, and fuselage bottom) to absorb the violence of the stopping process before it affects the occupants, (2) avoiding forceful bodily contact with interior structure.

What are the emergency ascent procedures for PADI?

PADI recognizes four emergency ascent procedures for low-on-air/out-or-air situations: Normal Ascent – The diver ascends at a normal rate with normally functioning equipment (e.g., if the diver is low on air).

Which is the second best option for an emergency ascent?

The alternate air source ascent is the second-best option for emergency ascent procedures because it allows divers to maintain a normal ascent rate and buddy contact.

What should you do in the event of an emergency?

Despite our best intentions, sometimes things just go wrong. But practice, planning, and good judgment can improve our odds of dealing with an emergency for the best outcome. Remember, first do no harm—fly the airplane and stay in control. Then assess the situation and troubleshoot.