Converting liters to cubic feet

[BoltSnap]

What is a metric meter as opposed to a regular meter?

I'd love to dive with you, even one dive. You must be loads of fun in person. I'm sure I'd learn a lot.

I mean it.

 

[LI-er]

I'd love to dive with you, even one dive. You must be loads of fun in person. I'm sure I'd learn a lot.

I mean it.

You gotta get him on a good day.

 

[Sascha314]

Lewis Carroll: Through the Looking-Glass.
“When I use a word,” Humpty Dumpty said in rather a scornful tone, “it means just what I choose it to mean—neither more nor less.” “The question is,” said Alice, “whether you can make words mean so many different things.”

Well I get what you are saying. I am as well usually more on this line, just define what you are saying and agree on this. But however there is a small distinct line, where you just mix up things and its physically wrong.

If you are talking to a somewhat broader, unknown crowd of people its much more efficient and correct to refer to standards. Otherwise its prone to errors, and potentially could lead to miscalculations and in worst case to oog situations (well ... if beginners and deep, you know ). So in this case I am more picky to define things correct.
Just an example what can happen if you do not define what you are using, and do not use standards..

Mars Climate Orbiter - Wikipedia

en.m.wikipedia.org

Happily surfaced after two dives yesterday with 53 and 93min runtime.

 

[justinthedeeps]

Yep, then it works exactly as the metric. Sometimes the math works out even easier. I'd rather multiply by 3 (Imperial tank factor) rather than 13 (metric tank factor) for an LP85/13L cylinder. Or 6 instead of 26 when doubled up!

For those who don't know, the tank factor is the ratio of capacity to pressure. LP85: ideal capacity of 82.4 cuft at rated pressure of 2640 psi (or 26.4 hundred psi to avoid decimals in the answer) 82.4/26.4 ~= 3. (Yes, they rounded up when naming it.) A 3000 psi fill has about 3*30=90 cuft of air (ignoring compressibility).

The only problem is we have to memorize the tank factor. It is stamped on the side of the Euro tanks (aka the water volume). That's because a 13 L cylinder holds 13 L of gas at 1 atm (1.013 bar). Tank factor = 13 / 1.013 ~= 13. A 200 bar tank therefore has about 2600 L (again, ignoring compressibility).

(The bilingual in the crowd will notice 2600 L ~= 90 cuft. Not surprising, as it's the same tank and approximately the same pressure, after all.)

That is interesting and sounds useful. But it just sounds like someone trying to re-invent the metric system. Of course we should use simple factors like this, which is what the metric system already does.

It's 2024, not the 1700's. Why are we still printing feet inches miles PSI pounds ounces on everything even when it is needlessly sloppy?

US was well on our way to modernizing units (like everyone else) up thru the 1970's, until the Reaganites layed down on it after brainwashing voters on a weird radical platform that nobody knowledgeable (not even core Republicans) took seriously (sound familiar?)

Sorry to get political, but that is why this thread even exists. Forty more years of needless confusion on units has persisted because of specific political punts by specific political teams.