99% of Divers Don't Know These Basic Nitrox Formulas

[@CircleHScuba]

Easy MOD and Best Mix Calculator 👉 circlehscuba.com/nitrox-calculators/ How to Analyze a Nitrox Cylinder ▶ kzbin.info/www/bejne/anvbXn9qpbuSfck

[@dakshchauhan8362]

hi

[@CircleHScuba]

Hey!

[@SummersideDiver]

Nice breakdown on working through the Nitrox formulas. I truly believe that we all need to know how the math works and how to do the math for each dive/tank. Explanations like this help us all. Thanks

[@CircleHScuba]

Thanks, I’m glad you found it useful. I was a bit hesitant to post a long video on math, haha, but I think it’s important and when someone needs to know how, it’ll be here for them!

[@SummersideDiver]

@@CircleHScuba while it’s likely that this video will not appeal to all your viewers, I am sure that there are many who will watch it and learn from it. We need a balance of content, both the fun (Mr Beasts cars) and more technical (like this) to become better divers. You are doing a great job at educating the public, both divers and non-divers alike, and creating valuable content while doing it. I can honestly say that I have gained more knowledge from your videos than I did from my AOW instructors. For that i greatly appreciate you sharing your experience and knowledge.

[@CircleHScuba]

Thanks so much Daniel. I definitely agree a balance is needed, though I will probably stick to the educational side. My goals for the content are fairly straightforward I think. As a diver, from signing up for open water to now as I work toward becoming a tech instructor, I’ve had questions that I can’t easily find answers to online. OR, the answers I find are from old blog posts, forums, books, etc. and not as convenient for me, OR just finding a single opinion versus a multitude of answers and opinions. So I simply am hoping to build a library of content to answer questions I’ve had that I know others have too, and hopefully in a way that is easy to understand and relatable to everyone.

[@spacewalktraveller1]

Thanks for the video, much appreciated.

[@CircleHScuba]

I’m glad you liked it!

[@josephdracula7487]

👍😎🇵🇭🤿! Good refreshing video! I feel that you have a great way of explaining this! Much better than my original certification. I know that you had a hard time compressing this in a short time! Great job 👍!!!!!

[@CircleHScuba]

Thanks! It was tough haha. I wanted a 5 min video but I can’t make it that small 😂

[@chrisphilhower6029]

I am doing my Nitrox course. Just waiting for the Instructor for the Hands On. All they taught me was Atmospheres times O2 percentage. And said that the Computer would calculate the PO2. Hoping to at a Max of 1.4.

[@adriansscubaadventure3251]

thank u soooo much

[@CircleHScuba]

Glad you found it useful!

[@yeetergriffin7679]

Future navy diver here, Im studying for my Asvab, specifically Electronics information section. Same exact formula or Ohms law! Very convenient and cool. I will pass both nitrox and Asvab with flying colors.

[@CircleHScuba]

Hey good luck! That’s great!

[@davidtorcello3765]

awesome content

[@CircleHScuba]

Thanks David!

[@pillar350]

So I have a question how do you keep the perfect seal with your mustache and beard because during my recreational dives, I kept having an issue where water would seep in through the bottom of my nose where my mustache is or goatee and I would have to use Vaseline to counter that is there something other than I can do?

[@CircleHScuba]

That’s the trick everyone does. I am lucky I guess with my mask fit because I don’t ever have to, but it’s very common for those with mustaches to have to put Vaseline on it

[@neogator26]

Great job breaking down the math. Having been mathed in the head for years in engineering school I’ve seen plenty of bad breakdowns for formulas.

[@CircleHScuba]

Haha thanks. I tried. It’s not THAT bad. Basic algebra, but it looks crazy 😂

[@mojo2131]

My brain hurts after watching this but I must say you explained it very well and everyone should know this diving nitrox or not . Thanks .

[@CircleHScuba]

It hurt me editing it and trying to follow 😅 Glad you liked it!

[@benheckendorn2696]

I learn this triangle best, when I teach it to others, so i did a fun math with my dad: I got nitrox30 and I want to dive to 60m, can I do it? 😂 Then we did another one: I want to go to 60m which is the best nitrox to do so? (I don't tell you, do the math, it will make you smile.)

[@addohm]

Its not specifically for nitrox. It (dalton's T) also applies to using helium when planning tech dives.

[@CircleHScuba]

Agreed, I think I said at a few points any gas and any PPO2, but I also said I wanted to keep it recreational focused for this one

[@benheckendorn2696]

I just did nitrox class a few months ago, but I learned: PP02 of 1.6 is max, for emergency or a short dive like, I had to pick up a gear I lost. But 1.5 PP02 could be possible, so tell me if I'm wrong: If it's a single dive at this day to a wreck for example the PP02 of 1.44 would be still fine. So, I would add this rule: PP02 1.4 if you plan more then one dive, PP02 1.5 would be possible for a single dive. 😯

[@CircleHScuba]

1.4 is the rule of thumb for recreational diving regardless. You can go less conservative but I personally don’t and wouldn’t.

[@benheckendorn2696]

​@@CircleHScubatrue, but as I learned, there's also the rule don't go above 100% O2. I would dive like this: if it's worth, because of a wrek or something amazing: 1.5 regular dives and if possible 1.4. The dive center, where I did my nitrox, does their nitrox themselves, so I could have nitrox22 for example, so much easier to keep at 1.4, but if you were at a boat dive, you may don't have the chance. Secoundly, If you choose 1.5, you still got the chance to got to 1.6, what I wouldn't do, to plan a dive which is already 1.6, because where is the reserve? When I told my dad about the PPO2, I told him: may we human survive even a PPO2 of 3, but I don't want to try. 😮 I was about 7.5 years a volunteer firefighter, so if I may had to save someone and I know I can. I May would even risk a PPO2 of 2, but those would be a situation. None would ever wish it would ever happen. But if you were a firefighter, you keep this, you will always, risk to save someone, as long as the risk isn't too high, but if someone who needs help, would be 20m deeper then you, you would Take the risk. But as I said, if such happen, maybe too much went wrong.😮

[@CircleHScuba]

I mean you can dive whatever you like, but I wouldn’t recommend 1.5 like I said. As for 100% O2, you may be misremembering and thinking what they call OTUs?

[@benheckendorn2696]

@CircleHScuba yeah :) I meant OTU, I also wouldn't do several dives with, 1.5 but I woundn't mind to do one or so, but understand what you mean.

[@thorreijs7954]

When i was doing my NitrOx course i flipped this formula around to make it more easy.... You can say PpO2*100/%O2 = depth-10 Assume that your ppO2 is a constant of 1,4 for conservative reasons, you get 1400 and the math will be easy. The value of your O2 is in percentage. Saves a lot of calculation errors😉

[@CircleHScuba]

It’s all the same math, just depends where you solve for which variable. Algebra at its finest 🤓

[@thorreijs7954]

@@CircleHScuba Oh i agree. Good explanation video though!😉

[@MaciejJeszkeP]

Most easy version for metric and you can do it in just line ... (14/Nitrox)-10=Max_Depth For 40% Nitrox (14/0,40)-10=25 m

[@EnergiZeScuba]

When is the imperal unit system better than metric? 😅🤷🏻‍♂️

[@CircleHScuba]

Honestly not often lol. Rule of thirds in PSI? 😅

[@yeetergriffin7679]

Psi

[@Nanookh54]

Teach students to go metric all the way. Makes quick calculations under water (e.g. in case of lost gas and replacement is offered) a lot easier than introduce that 33 in the equations. You're using the (metric) ATA anyway.

[@CircleHScuba]

Haha I mean I try to do both but default to imperial since I’m in the US. Can’t deny base 10 is pretty easy 😅

[@javierlopezav8917]

100%

[@MysticalDragon73]

Nanook piss on the metric system. We don't need or use that junk here

[@PaulPSP33]

bet u won't pin this

[@CircleHScuba]

You’re right haha. I pin the links I talk about in the video instead, sorry haha

[@PaulPSP33]

@@CircleHScuba nice man i won a bet 😎

[@CircleHScuba]

😅

[@DearhRATTLE]

I think I'll never be able to dive mix gas or rebreather I feel like it's way to advance for me and above my math skills

[@CircleHScuba]

You’ll get it down. This is why you take a course though. A video like this is decent review but you need courses that are multiple days for trimix and rebreather

[@DearhRATTLE]

@@CircleHScuba thanks for the reply yeah I would hope so lol. I got a free course voucher at my local dive shop for any specialty. I think I may use it on the. Trimix. Rebreathers scare the hell out of me..

[@Mr_D555]

TMI, just buy a dive computer. You did explain it very well though.

[@CircleHScuba]

Totally, I said your dive computer can do it, but then no one knows how it actually works (hence the title haha)

[@ODZamir]

Use 1.6. PP and 32% is 40 m and 1.6 PP and 36% is 34.4 or 34 m.

[@CircleHScuba]

You use 1.6 for all parts of the dive or just deco?

[@Sidemount_Ben]

@CircleHScuba MOD is max. So that is a 1.6.. when labeling bottles and such. However it's fine to use 1.1/1.2/1.3/1.4 for the working part if you wish. But planning I would stick to 1.6 = MOD = MAX. SO, I really love the video and so very glad you did this. I've actually sent this to my friends and some students. Keep it up. I would mention in this that the 33 if for salt and 34feet is for Fresh. kind of matters for some of us if we dive both.

[@CircleHScuba]

@Sidemount_Ben I mentioned the 34 for fresh in the video, thanks!

[@AlexArrigoni71]

I use an App LOL

[@CircleHScuba]

You can! I also wrote a calculator too on my website. But it’s good to know how it all relates regardless imo!

[@AlexArrigoni71]

@@CircleHScubajust kidding. Thanks for your explanations. Very useful

[@CircleHScuba]

Haha well thank you too

[@jonnieinbangkok]

Unless you're tech diving with custom gas blends, there's no reason to know any formulas when using Nitrox. At least in Asia, where I dive, for recreational dives, all you'll get are EAN32 or EAN36; and all one needs to know are the 33m and 29m MODs respectively.

[@CircleHScuba]

Let’s try this as an example: let’s say I visit your area and don’t have those two memorized, wouldn’t you think it’s important to know how to look it up or calculate it at the least 😅 Memorizing something isn’t knowing something, and this video is to teach people the why behind the numbers and how to figure it out. It’s important for planning, it’s important to know generally rather than blindly reading a table or computer without knowing the why behind it, and then for the last one it’s “best mix” which is useful all over the world. Your local area may not offer custom mixed but to say that there’s no reason is kind of crazy to me 😅

[@LeeLeatherbarrow]

You couldn't be more wrong.... Whilst I can't argue that there may be less need for where you dive. Over here in the UK, we rarely use "Banked" standard Nx mixes. It is far more common for partial pressure blending to be used. And whilst we have very good blenders who can consistently hit the requested Nx mix. There are times where we, as divers, will get Nx3n as a first fill. Then depending on where we are, or what we're doing for our next dive we will simply top up the cylinder with air without draining the cylinder (to make it a little cheaper or dive boat logistics mean it is impractical). We can then use math to work out what the Nx mix in our tank will be to see if it will be suitable for the next planned dive. If not, we may need to let more gas out before we fill to ensure we have a suitable mix. (We would also check once filled using an analyser for confirmation.) We then use the additional math to label the tank with an appropriate MOD. But "custom blends" are far from a tech dive thing. A cylinder of Nx32 breathed down to 100bar, topped back up to 230bar with Nx21 will result in roughly Nx26, which when breathed down to 100bar and then topped back up to 230bar with Nx21 will result in a cylinder with roughly Nx23 in it. Three Nx dives from one cylinder originally filled with Nx32...

[@xarenijacobo6203]

Thanks for the video. Just a geográfica Thiago. América is all a continent. Maybe you mean USA. Greetings.

[@CircleHScuba]

Yes I mean the US. Most people know that when they see an English speaker refer to America but I know there’s multiple American and continents, haha

[@ee02108]

I think if you need formulas or some memory helpers, you didn't understand how things work. When you do you will not need to memorize stuff, everything is obvious.

[@CircleHScuba]

I’m sorry but that is ridiculous, haha. How do you think the math works? It’s a formula whether you want to call it that or not.

[@ee02108]

​@@CircleHScuba​ if you have 2 rocks and I give you another 2, you will not think about the formula for calculating total amount of rocks, you know you have to add 2+2, you understand what you are doing, its obvious. That's what I was trying to say.

[@CircleHScuba]

@ee02108 I think this is a bit more complicated. Not many can do multi decimal point division and multiplication in their head and having a base idea of what to do (which to multiple or divide) is literally what a formula is. Knowing to take ppo2 and divide by the fractional gas percent for example to then get pressure and convert that to a depth. You have to know what gets you to the answer and it’s not second nature for a gigantic majority. To think otherwise is a bit too much in my opinion. I hear you, with time you can easily remember what to do, but that’s saying you remember what to multiply by what or what to divide by what. Which is a formula 😅

[@ee02108]

​@CircleHScuba I'm not saying to divide by head the numbers, I'm saying knowing what to divide, that should be clear, not because you remember the formula but because you understand the concept. Like you have a cake for 4 people, how many cake each one will have? You know you have to divide 1 by 4 and I hope it's not because you remember a formula. That's how my engineer brain see things.