Bar to psi conversion diving

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bar to psi conversion diving

Joining is quick and easy. Login or Register now by clicking on the button Log in or Sign up. Discussion in ' Basic Scuba Discussions ' started by isurusMar 5, Search Media New Media.

Benefits of registering include Ability to post and comment on topics and discussions. A Free photo gallery to share your dive photos with the world. You can make this box go away Joining is quick and easy. I'm headed to the carribean shortly and I know american and therefore i presume carribean dive ops tend to use psi instead of bar.

Can anyone just confirm the relevant conversion ratios and give any tips on anything specific to the us type diving ops I need to know? One difference between the UK and the carribean -in the carribean a dry suit is what you change into after a dive.

The other difference you will see is that the tank sizes are for the amount of free gas, not the water capacity. You will probably be diving an AL80 about 77 cu ft or liters. Tank is about 11 liter size, bar.

For the shallow Keys dives, what finally worked for him was "in the red, we should be on the boat, or at least at safety stop". In the yellow psi on his rental gear IIRC"we should be headed back". Charlie99Mar 5, I've got one of those color coded guages, green suck all the air you want yellow time to find your buddy and plan your assent and red times up It works great, a no-brainer, I don't need to know metric or imperial.Please provide values below to convert bar to psi [psi], or vice versa.

Definition: A bar symbol: bar is a metric unit of pressure that is defined as exactlypascals symbol: Pa. It is equal to 0. The term "bar" comes from the Greek word "baros," which means weight. Current use: Although the bar is a metric unit of pressure, it is not accepted within the International System of Units SI and is even deprecated within certain fields. The International Bureau of Weights and Measures has specified the bar as a unit that authors should have the freedom to use but has chosen not to include the bar in the list of non-SI units accepted for use with SI.

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Millibars symbol: mb are also commonly used when referencing atmospheric air pressure, where atmospheric pressure equals Meteorologists and weather reporters worldwide often use this unit for convenience, since working in pascals would result in much larger values. Definition: A pound-force per square inch symbol: psi is an imperial and US customary unit of pressure based on avoirdupois units. It is defined as the pressure that results when a force of one pound-force is applied to a one-square-inch area.

It is based on the avoirdupois system, a system that uses weights in terms of the avoirdupois pound, which was standardized in The system is believed to have come into use in England around and was used in the international wool trade. As such, the prototype pound at the time was known as the avoirdupois wool pound. Current use: The psi is fairly widely used to measure numerous pressures, such as tire pressure, scuba tank pressure, natural gas pipeline pressure, among others.

Although the pascal is more widely used in scientific contexts, psi is more often used in everyday contexts, particularly in countries like the United States as well as others under the US customary or imperial systems of units. From: bar To: psi.Air consumption rate is the speed at which a diver uses the air in the tank. Air consumption rates are usually given in terms of how much air a diver breathes in one minute on the surface, at one atmosphere of pressure.

Knowing your air consumption rate is useful in scuba diving because:. Divers have been known to ask other divers "How much air did you surface with?

Scuba Diving Bar And PSI Converter

There is no "normal" breathing rate among divers. Different divers require different quantities of air to properly oxygenate their bodies. A diver need only be concerned with calculating his or her average breathing rate. Trying to lower air consumption to "beat" another diver may accumulate carbon dioxide or under-oxygenate a diver's body, which can be dangerous. A diver should focus on slow, calm, full breaths that properly ventilate the lungs and not compete to use less air.

Divers typically express air consumption using surface air consumption SAC rate and respiratory minute volume RMV rate. SAC rate is a measurement of the amount of air a diver uses in one minute on the surface. SAC rates are given in units of pressure, either psi imperial or bar metric. Because SAC rates aren't transferable between tanks of different sizes, a diver usually begins air consumption calculations using the RMV rate, which is independent of tank size. The diver then converts the RMV rate to a SAC rate based on the volume and working pressure of the tank to be used on the dive.

RMV rate is a measurement of the breathing gas that a diver consumes in one minute on the surface. RMV rates are expressed in cubic feet per minute imperial or liters per minute metric. A diver who breathes 8 cubic feet of air a minute will always breathe 8 cubic feet of air a minute regardless of the size of the tank holding the air.

So most divers remember their air consumption rates in RMV format.

bar to psi conversion diving

Gas planning is typically worked through in RMV format and then converted to either psi or bar based on the type of tank to be used.

Every training manual lists a slightly different method of gathering the data to calculate a diver's air consumption rate. Whichever one you choose, remember to enter the water and allow your tank to cool before beginning your data gathering. As your tank cools, the pressure shown on your submersible pressure gauge SPG might drop or psi. Failing to account for this drop in pressure will result in calculating an inaccurately high air consumption rate.

Method 1: Collect data during normal fun dives. Many divers prefer this method of calculating air consumption because it uses data from normal dives. However, because the resulting rate is based on an average depth of an entire dive, it is unlikely to be as accurate as the following method.The above form works if you are measuring differential pressure, such as the difference in psi between two points. It also gives the correct answer for absolute pressure, assuming you are measuring psia, which is the pressure relative to absolute zero vacuum.

If you are measuring relative to vacuum and want to resolve the pressure relative to the atmosphere, then you should use the form below.

Scuba Tech Tips: How Much Air? Cubic Feet or Liter's - S06E18

How many bar in 1 psi? The answer is 0.

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You can view more details on each measurement unit: bar or psi The SI derived unit for pressure is the pascal. Note that rounding errors may occur, so always check the results. Type in your own numbers in the form to convert the units! You can do the reverse unit conversion from psi to baror enter any two units below:. The bar is a measurement unit of pressure, equal to 1, dynes per square centimetre baryesornewtons per square metre pascals.

Its official symbol is "bar"; the earlier "b" is now deprecated, but still often seen especially as "mb" rather than the proper "mbar" for millibars.

Bar vs PSI

It is the pressure resulting from a force of one pound-force applied to an area of one square inch. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure, and other types.

Examples include mm, inch, kg, US fluid ounce, 6'3", 10 stone 4, cubic cm, metres squared, grams, moles, feet per second, and many more!Welcome to ScubaBoard, the world's largest scuba diving community.

Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions. Joining is quick and easy. Login or Register now by clicking on the button Log in or Sign up. Search Media New Media. Benefits of registering include Ability to post and comment on topics and discussions.

A Free photo gallery to share your dive photos with the world. You can make this box go away Joining is quick and easy. At first it did cause a bit of confusion but after a couple of dives I got used to converting in my head. The question I have is the DM's gauge had the red line starting at 50 bar or by my calculations about psi. My gauge has the red line starting at psi or about 35 bar. Why the differance?

What do most DM's use for a minimun air point? HelipilotMar 28, ScubarooMar 28, TobagomanMar 28, DiversaurasMar 28, Thanks everyone for the great info. I guess I should have been a bit clearer with my question. I was wondering why the gauges are marked differently. Is it a function of Bar vs PSI? Or is it just the choice of the gauge manufacturer?

bar to psi conversion diving

I agree that during a dive is not the place to be doing conversions in your head. I have since used a label maker and added some key BAR amounts on the glass. HelipilotMar 31, MoonWrasseMar 31, VieMar 31, Marek KMar 31, You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet. Your name or email address: Do you already have an account? No, create an account now. Yes, my password is: Forgot your password?By entering your email address you agree to get a weekly email newsletter from ScubaOtter.

We'll respect your privacy and unsubscribe at any time. Both are measurements of pressure. This is a metric measurement. This is an imperial measurement.

In scuba diving, these measurements are relevant for two reasons:. Atmospheric pressure is the amount of pressure exerted at sea level. This is essentially the weight of the whole atmosphere pressing down on an object, for example, your body. As a result, it is much easier to measure atmospheric pressure in Bars than PSI, which is around As you descend into the water, which is much denser than the atmosphere, you accumulate atmospheric pressure more quickly. For every 10m descended, an extra 1 bar of pressure will press down on you.

Check out the table below:. Not quite as easy to calculate, but still doable! Your SPG submersible pressure gauge is connected to your tank using a pressurized hose, so it can accurately measure the pressure in your tank, which is directly proportional to the amount of air you have left. A scuba dive usually begins with a full tank — around bar or PSI. Well, we have two measurements as a result of the metric and imperial systems. The imperial system is mostly found in the US, with bar used in metric predominant Europe and Asia.

bar to psi conversion diving

It is not vital to fully understand both systems, but it is a good idea to be aware of full tank measurements. Ah, now we get to the controversial bit!

Divers tend to get very attached to the system they learned to dive with, which is only natural. Tanks usually have capacities of 10, 12, 15 and 18L.

In order to work out the volume of air remaining, you just multiple the tank capacity with the remaining pressure:. Doing this calculation in imperial measurements is more complicated — just try remembering that 1L is the equivalent of 0. These measurements can be used to help to work out your surface air consumptionor SAC rate.

Doing calculations for Nitrox partial pressures is also much simpler with the metric system. Have you taken the plunge with enriched air yet? Check out our Ultimate Guide to Nitrox here! If you want to know more about the partial pressures of gases at depth, check out this super helpful video! On the defense of imperial systems, they are often favored by technical cave divers. These divers dive using the three-thirds rule — one-third of the tank is used for the outward journey, one third is for the return trip and one third is reserved for safety.

Tanks filled to PSI make this calculation much easier. Check out our blog on thermoclines next!Please provide values below to convert psi [psi] to bar, or vice versa. Definition: A pound-force per square inch symbol: psi is an imperial and US customary unit of pressure based on avoirdupois units.

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It is defined as the pressure that results when a force of one pound-force is applied to a one-square-inch area. It is based on the avoirdupois system, a system that uses weights in terms of the avoirdupois pound, which was standardized in The system is believed to have come into use in England around and was used in the international wool trade.

As such, the prototype pound at the time was known as the avoirdupois wool pound. Current use: The psi is fairly widely used to measure numerous pressures, such as tire pressure, scuba tank pressure, natural gas pipeline pressure, among others.

Although the pascal is more widely used in scientific contexts, psi is more often used in everyday contexts, particularly in countries like the United States as well as others under the US customary or imperial systems of units.

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Definition: A bar symbol: bar is a metric unit of pressure that is defined as exactlypascals symbol: Pa. It is equal to 0. The term "bar" comes from the Greek word "baros," which means weight. Current use: Although the bar is a metric unit of pressure, it is not accepted within the International System of Units SI and is even deprecated within certain fields.

The International Bureau of Weights and Measures has specified the bar as a unit that authors should have the freedom to use but has chosen not to include the bar in the list of non-SI units accepted for use with SI. Millibars symbol: mb are also commonly used when referencing atmospheric air pressure, where atmospheric pressure equals Meteorologists and weather reporters worldwide often use this unit for convenience, since working in pascals would result in much larger values.

From: psi To: bar.


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