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Diver Mask
Drysuits for Boaters, Scuba Divers, Swimmers
Exploring the world under the sea is always fascinating. But to move freely underwater is not so easy as to move on the land. To be alive under water one has to carry a tank full of oxygen as breathing is not possible under water for human being. Beside that the tremendous pressure and different temperature of the water in deeper are much more different from the land.
For Scuba (Self Contained Underwater Breathing Apparatus) diving the divers, boaters, sailors, swimmers, Water Adventurers, surface-water sports persons often use these things besides the full tank of oxygen:
1. MASK
2. FINS
3. SNORKLE
4. DRY SUIT and so many things.
Maintaining body temperature is one of the biggest problems for the divers. Dry suit is a kind of apparel, which gives the wearer protection from the water to his skin. Dry suits are used to prevent the water entering. Drysuits are used where the temperature of the water is between –20c to 150c.
There are three types of dry suits:
1. Membrane dry suits
2. Neoprene dry suits
3. Hybrid dry suits
1. Membrane drysuits - are mainly built of thin materials of vulcanized rubber or a compound of nylon and butyl rubber. These types of dry suits do not give any real thermal protection in colder water. And these dry suits do not stretch, and needed to be oversized to the joints to give the wearer flexibility at the time of movements. Sailors and boaters who are likely to be out of water prefer these membrane dry suits. Membrane dry suits are easy to wear and put off. Membrane drysuits are mostly used in the spring.
2. Neoprene drysuits - offer the thermal protection in the colder water, keep the buoyancy. Neoprene is thermal insulating material, made of heavy-duty fabric and that fabric is coated with rubber or Polyvinyl chloride better known as venyl. The neoprene dry suits are considered better in comparison to membrane dry suits. Neoprene has some better properties, which make this more useful, chemical-resistant, more stretchable buoyant and waterproof. Neoprene drysuits give greater thermal protection even if there is a leak. Neoprene drysuits are mostly used for water surface sports and in the cold water.
3. Hybrid drysuits - are made by the combination of the membrane material and neoprene material. In hybrid dry suits, the upper part of the suits is made of membrane material and the lower part starting from the waist is made of Neoprene materials. So that the tight fitting lower part of the dry suits gives the comfort to the wearers to kick the water to move a distance when they are swimming. And the loose upper part of the dry suits lets the wearer to free movement of their arms. Hybrid drysuits are mostly used for water surface sports and in the cold water and where the divers are going deeper.
Modern drysuits are having a waterproof zippers & hydro gloves. The zippers are mostly located across the shoulder lines or in the front of the torso, to wear the dry suits easily. Drysuits may have the hydrogloves, permanently attached to the drysuits or with attachment rings. Modern drysuits have the air inflation valve, which empowers the diver to control the buoyancy of the suit by injecting air from the diving regulator to get rid of squeeze under deep water. A drysuit is worn over an insulating undersuit.
A modern drysuit has an air ventilation valve, which allows the diver to release the higher-pressure air from the suit when they are coming out of the water. Ventilator valves may be automatic or manual. It is used as the pressure relief valves. Most of the automatic ventilators are located at the shoulder of the dry suits and the manual ventilators are located at the wrist.
A modern version of the two-piece drysuit is manufactured at Customworks at Idaho. These two-piece drysuits give all sorts of comfort to the divers, boaters, swimmers, sailors, cave divers and the water adventurers. They are making the drysuits considering the needs of its users.
About the Author
Abir Roychowdhury is a professional Internet Marketer & Sr. Executive SEO of KarmickSolutions.com. WWW.Hydroglove.com is the online resource for Scuba Gears, Diving Equipments and provides an expanding line of Rubber Molded DrySuits, Dive Kits, HydroSuits, HydroGloves, wetsuits, snorkles, masks fins, all are made for collectors, surfers, swimmers and vintage divers.
Chemistry Gas Laws Help!?
A sample of 320. mL of nitrogen (N2) gas is at a pressure of 735 torr and a temperature of 15°C. The temperature of the sample was changed in such a way that the sample occupies a volume of 500. mL at a pressure of 1250 torr. The new temperature is:
39.9°C
765°C
-165°C
492°C
A bubble of air escaping from a diver’s mask rises from a depth of 103 ft to the surface where the pressure is 1.00 atm. Initially, the bubble has a volume of 10.0 mL. Assuming none of the air dissolves in the water, the bubble _______ is times larger just as it reaches the surface. (The density of seawater is approximately 1.025 g mL-1; the density of mercury is 13.6 g mL-1.)
A 2.00 g sample of a gas was collected in a 500. mL gas bulb until its pressure reached 652 mm Hg at a temperature of 20.0°C. Which of the following hydrocarbons might this sample be?
Please help! I'm struggling with this in class!!
the last question's hydrocarbons:
C7H14
C2H4
C10H30
C8H16
The first question is very poorly phrased. It implies, but does not explicitly state, that heat transfer occurs.
If heat is added you use PV = nRT to solve this, but if no heat is added [an adiabatic process] and someone pushed a piston in rather than playing a flame on the cylinder, then you use
PV^gamma = constant.
gamma = heat capacity at constant pressure/heat capacity at constant volume = Cp/Cv
For N2 gamma = 1.4.
So the question is ambiguous to start with.
However, if PV^gamma is news to you in this course, then use PV = nRT
PV = nRT ---> n = PV/RT = P1V1/RT1 = P2V2/RT2 since there is no n1 and n2; n didn't change [unless they changed the temperature by dribbling in liquid nitrogen, in which case there is a different calculation - badly phrased !!]
Take the last bit P1V1/RT1 = P2V2/RT2 and solve for T2
T2 = P2V2T1/P1V1 = but first put T into Kelvins ! = 1250 x .5 x [273 + 15]/[.32 x 735]
Second one: A bubble of air escaping...
Pressure from a column of liquid = density x height x acceleration due to gravity [9.8 M/S^2]
http://en.wikipedia.org/wiki/Pressure
At depth the bubble is under pressure from the water column as well as atmospheric pressure.
So
1] Convert 103 feet to meters; now you know the water pressure in meters of water column.
2] That number of meters of water column x [1.025/13.6] = meters mercury column
3] 1000 x meters Hg = mmHg, millimeters of mercury
4] 760 mmHg = 1 atm, so divide mmHg from above by 760 to get {atmospheres from water depth}.
5] Add one [for the one atmosphere of air pressure at the surface] to the {atmospheres from water depth} to get total pressure at depth.
6] Again, PV = nRT, n didn't change but now we want V
P1V1/RT1 = P2V2/RT2 from above but now I want to use s for surface and d for depth to be clear
[NOTE: Nothing has been said about any temperature changes, so assume there is no change in water temperature from depth to surface, and that there is heat transfer to the bubble so it is not an adiabatic process. Also assume no evaporation of water into the air bubble, both because of heat of vaporization, and because of partial pressure of water. Problem poorly phrased.]
PdVd = PsVs ---> Vs/Vd = Pd/Ps
Since Ps = 1 atm, the bubble is bigger by a factor of
{total pressure at depth in atmospheres/1 atmosphere}
THird one: A 2.00 g sample of a gas...
YOu are given P, V, T, and mass. FInd n = PV/RT
2 g / n = molar mass
You didn't give the list of hydrocarbons, but I assume you can find their molar masses
Ocean Reef Full Face Diving Mask