How does a scuba diver become less or more bouynt?

What is scooter scuba diving?

"Scuba scooter" is usually just slang for a diver propulsion vehicle (or DPV). It is basically like a torpedo with handles that a diver can ride. It enable the diver to go further, faster and using less air (because she gets less tired from swimming).

What helps a scuba diver sink and float?

Scuba buoyancy is the most fundamental diving skill. Mastering buoyancy control enables a diver to use less effort to maintain his position while diving.

If the force of gravity on a scuba diver is 600 newtons what should the buoyant force be if the diver wants to descend?

Less than 600 Newtons.Less than 600 Newtons.Less than 600 Newtons.Less than 600 Newtons.

Why do the bubbles exhaled by a scuba diver grow as they aproach the surface of the ocean?

The bubbles exhaled by a scuba diver grow as they approach the surface of the ocean due to the decrease in pressure. As the diver ascends, the surrounding pressure decreases, causing the gas in the bubbles to expand. This expansion makes the bubbles appear larger as they rise to the surface.

What would be a good comparison of the affect of a 2 knot current on a scuba diver compared to a wind current on land?

Currents have a disproportionately greater effect when pushing water against a scuba diver than wind does when pushing air against a person above the surface. This is for two reasons: firstly, water is much more dense; secondly, a diver swimming has less propulsion than a person walking (ie. you can walk faster and with less effort than you can swim). I am not aware of any scientific formulae comparing the two, but I would compare swimming into a two knot current wearing scuba gear as the rough equivalent to trying to walk into a windspeed of approximately 30 knots.

Why scuba divers experience a higher pressure at the bottom of the sea than on the surface of the earth?

This is mainly do to the pressure that the water above the diver is putting on the diver. On the surface air is putting pressure on you but it has less weight than water and as you dive deeper the pressure increases because the amount of water above you also increases.

What does it mean when a scuba diver places his mask on his forehead while in the water?

Technically speaking this has no relevance to the quality or action of diving. It is not a formal signal of any status nor skill level. In the social context of the dive community it is taken as a sign that the Diver in question is less experienced as this action is one of the most common ways to loose a mask. (www.scubaboard.com has many references to this practice)

When a piece of material is immersed in a liquid of equal density the material will?

Neither float (which it would if the material were less dense) nor sink (which it would if it were more dense). It will "hover" wherever you place it in the liquid, like a scuba diver who has neither negative nor positive buoyancy.

How does a scuba diver control their depth?

WARNING: A BIT OF MATH FOLLOWS A diver's buoyancy is determined by the mass of the water they (and their attached equipment) displace. Water density varies with temperature and salinity, but a good rule of thumb is that 1 cubic meter of water "weighs" about 1029 kilograms. That pencils out to about 64 pounds per cubic foot. A typical diver displaces about 2.5 to 3 cubic feet of water. That's equivalent to about 160 to 192 pounds of sea water. Let's assume the diver displaces 2.5 cuft of water. That means that the water they displace will "support" 160 pounds. If the diver weights less than 160 pounds, she'll be positively buoyant and will float. If she weights more, she'll be negatively buoyant ad will sink. The ideal circumstance that a diver strives for is to be neutrally buoyant, so no energy is expended to keep from sinking or floating. If our diver and her gear weigh 160 pounds, she'll be neutrally buoyant. In practice, our diver will carry enough weight to make her approximately neutrally buoyant. If she inhales air from her scuba cylinder, her chest cavity will expand, displacing a higher equivalent weight of water, and she'll ascend. If she exhales, she'll displace less water, and will descend. This ideal neutrally buoyant state allows a diver to ascend and descend with minimal effort. In practice, however, things are constantly changing during a dive. Wetsuits compress with depth, meaning the deeper our diver goes, the less water she'll displace. So as she descends, she'll have a tendency to descend more quickly. Her scuba cylinder displaces a constant amount of water, but the more air is used, the less it will weigh. This means that our diver will have a tendency to become more positively buoyant... she'll "float" more... as the dive progresses. In order to adjust for all of these variables, divers wear a "Buoyancy Compensation Device" (BCD). This is generally a vest shaped bladder that can be inflated using air from the scuba cylinder. It is fitted with a dump valve that allows fine tuning of the amount of inflation, and thus the amount of water it displaces. During a dive, our diver will adjust the amount of air in her BCD to maintain neutral buoyancy. Then she'll use her breathing to make fine adjustments in her vertical position. Divers diving in colder environments will often use a dry suit in place of the wet suit worn by most recreational divers. This dry suit is filled with variable amounts of air from the scuba cylinder, much the same way a BCD is. A dry suit can be used alone, or together with a BCD, to control buoyancy. In all cases, a diver will use a depth gauge, or a dive computer which measures depth, to monitor their depth throughout a dive.

Why does the diver speed decrease just after entering the water?

The drag force exerted by the water on the diver rapidly decelerates the diver's speed after entering the water. This force opposes the motion of the diver and causes a quick decrease in speed. Additionally, the change in medium from air to water also affects the diver's speed.

How do the changes inside the diver affect its position in the surrounding fluid?

Changes inside the diver, such as changes in buoyancy or density, can affect the diver's position in the surrounding fluid by causing the diver to either sink or float. For example, if the diver becomes less dense than the fluid, they will float to the surface. Similarly, if the diver becomes denser than the fluid, they will sink to the bottom.

Why will a diver become less buoyant as he swims deeper?

The question is based on an incorrect assumption. The correct question is "Will a person become less buoyant as he swims deeper? Why or why not?" The answer is "it depends." If the person is freediving - yes. His lungs will compress and his volume will decrease while his weight remains constant. If the person is on SCUBA and assuming no exposure suit and correct weighting, no. On SCUBA, a person's lungs will not compress. His volume will remain the same. As he uses air, the weight of his system will decrease and he and his SCUBA unit will become more (not less) buoyant. If the person on SCUBA is wearing an exposure suit and/or is overweighted (requiring air in the BC), the suit and/or BC will compress and make the person less buoyant. Andy's answer is correct within the limits of the situation he describes. Because ambient pressure will increase with depth, decreasing the volume (and thus your bouyancy) of any air pockets present, whether in your BC or your wet suit Assuming the same volume of air in your BC at 50 feet and at the surface, at 50 feet that air will be compressed into a smaller volume, thus your bouyancy will be less than at the surface. If you ascend from 50 feet, that air will start to expand, increasing your bouyancy (and thus possibly leading to a runaway ascent) If you descend from 50 feet, that air will start to compress, decreasing your bouyancy (and thus possibly leading to a runaway descent) Buoyant force is the upward force on an object. I allows objects to float.