And before you say “Well, that is why you use metric”: This solver assumes kg/m^3. That solver assumes g/mm^3 because it is generally used at a very different scale. And that one is kg/cm^3.
Well, that is why you use SI units.
Comment on Makes more sense than the Imperial system
NuXCOM_90Percent@lemmy.zip 2 weeks agoThat is ALL measurement systems.
Metric is based on standard meters and kilograms and so forth. And, funny enough, imperial measurements are more or less always based on metric measurements (which are based on said references for metric measurements) anyway.
I still think it is annoying to have to learn and internalize multiple systems (even if “6 feet” is easier to remember than “about 1.8 meters”). But unless you are doing scientific computing (where some of the constants map well to metric when working with certain materials at certain temperatures and pressures), it really doesn’t matter.
All that matters is that everyone stay consistent. And before you say “Well, that is why you use metric”: This solver assumes kg/m. That solver assumes g/mm because it is generally used at a very different scale. And so forth. And that sick fuck insists on 3 space indents in all code.
smeg@feddit.uk 2 weeks ago
mexicancartel@lemmy.dbzer0.com 2 weeks ago
Meter is defined as the distance travelled by light in vaccum in 1/299792458th of a second. Then kilogram is defined with a kibble balance. The problem with standaed objects is that it is not fundamental. If the standard decays, the measurements all turn wrong. It is important to associate theese to fundamental constants, which does not change and can be independently measured.
Would use 180 cm which is not as hard to remember, with more precision. Also why 6 feet specifically? 160cm becomes 5 and a quarter feet which is pretty messed. My argument here is bad because we are comparing magnitudes of units, which is useful in different scenarios. But i see no problem that is not fixed by dividibg or multiplying the current one by powers of ten and calling it centi, kilo, mega, micro, etc.
Nit just the scientific computing, but imperial system is harder to learn because there is no specific fashion in the units. How much inch is a foot and how much foot is a yard(?). Actually i don’t know thoose they change between 6 and 12 and maybe more different numbers. The thing you are talking about is watet’s volume, which can make water’s densitt a standard and measure densities of other fluids relative to water. But the conversion factor of 10 is the most advantageous thing which is also simple.
The solver assuming any unit is hilarious. Units must be always specified. You can’t take a measurement in terms of some units and then not say the units. There is no point of using exact same units(without scaling) just to be consistent. You are supposed to use different units for different scales.
That’s why I preffer tabs ;) You can have whatever number of space you want without annoying others. It will be consistent for different setups
NuXCOM_90Percent@lemmy.zip 2 weeks ago
No, it isn’t. The speed of light is 299792458 meters per second. The meter was not defined as someone saying “Hey, let’s get a drunk guy to spew a big number and divide the speed of light by it”. Depending on the story you believe, the meter was initially either based on math related to gravity or as a function of a quarter of the Earth’s circumference.
Because, once you realize that imperial feet are a function of standard meters anyway, you can make the same claim regarding it being a function of the speed of light. I just don’t care enough to do the math on that one.
In the western world, 6 feet is a pretty common reference since adult males tend to cluster around that height range. So if you are guesstimating the height of someone or something, you can use a person you know is “about six feet tall” as a reference. Same thing with ceiling and door heights. Which speaks to cases where precision is not important and is actually detrimental.
Because, in every day life, we don’t need or want that level of precision. If I actually want to know how long something is to the centimeter (or beyond)? I’ll get a tape measure. If I want to estimate where the middle of my climbing rope is after the middle mark has worn off? I can use arm spans to get “close enough” that I can rappel in any situation where I am not going beyond 20 something meters (and you can bet that I am guesstimating a meter to be approximately a yard in that case…). If it really matters? I am getting a reference (in that case just pulling up both strands).
No arguments there. I still have no fucking idea how long a mile is and will never know. That said, “foot” is actually a pretty good name because that can generally be approximated with an adult male (yay sexism)… foot. I know my foot is about ten inches long (I am dainty) and can do quick estimates at room scales based on that. Same with knowing my stride is about 3-4 feet which is about a yard.
But also? It doesn’t actually matter. Because, again, people don’t need that level of precision in their every day life. Again, if I want to know the dimensions of a room, I get a tape measure. If I want to know if a chair will fit in the corner? I can guesstimate by arm spans and so forth. If I get close? That is when I get the tape measure out. Otherwise? It genuinely does not matter
Scaling by powers of tens and arbitrary constants are more or less the same as far as a computer is concerned. And once you consider that so much of scientific computing is a function of constants anyway, you aren’t actually getting that much if you are using metric versus imperial so long as you understand what units you are converting to what units.
Because…
Exactly (although there actually ARE a lot of unitless solvers in certain fields because you put things in terms of the known constants). At which point it genuinely does not matter so long as the interfaces are documented and the scale makes sense for the math being done (which is more about floating point precision).
We all rightfully clown on NASA for lawn darting Mars because they were using imperial gravity instead of metric. But the reality is that it shouldn’t have mattered and the problem was not one of some asshole wanting to use ft/s and instead a miscommunication and lack of standardization/style guide amongst the team.
Personally? I prefer to only use metric when speaking anything scientifically. But I also am under no illusions that it makes a meaningful difference in the age of scientific computing.
But the big issue whenever this crops up is that people insist that precision is what is important. And… for science, yeah. But you are using tools for that if it truly matters which gets us back to the same lack of a meaningful difference.
But day to day? That is all about estimates based on references. And there is a LOT of benefit to coarser grain units that are largely designed around human measurements. Because, I don’t know about you but my brain and eyes are not good enough to guesstimate to within a centimeter. But I am pretty good at getting within 10-15… which lines up well with an imperial foot.
And I made a big deal about how 6 feet is a good baseline but… even then it is less “oh, Jan is 6 foot 9 and they are slightly shorter so they are probably 6 foot 5? 6 foot 6?” and more “They are a bit shorter than Jan” which is enough precision to convey someone’s height to a friend so long as we both know Jan.
And I do a lot of rock climbing. And that is where stuff gets REAL stupid. Because we all more or less know that 200 pounds is one kilonewton (actually 224.8-ish). So we tend to guesstimate forces involved to know whether we need to find an Edelrid Ohm for a belayer or what by roughly approximating body weight to 200 pounds. Which is not that dissimilar from approximating one kN as 100 kg (at Earth’s gravity) but, at that point, we are already using percentages of a reference.
And that is the actual important thing. If you are trying to communicate data with precision? There is no reason to NOT use metric but… that is more just because most of the world uses metric.
If you are trying to use measurements that make sense in real life? Use references that make sense for what you are measuring and the precision you can expect.
mexicancartel@lemmy.dbzer0.com 2 weeks ago
No, it is! It just wasn’t. It was initially based on something else but it now is exact.
The imperial units being a function of standard units is not enough. That is tedious conversion. And you seem to repeatedly emphasize its for “common people” and “everyday life”. If digferent units for same quantity isn’t a multiple of powers of 10, then the conversions are no mind calculation. This would alienate units of same quantity from each other.
The six feet thing is just a reference arised only because that unit was used. We could still use “about 160cm(or 16dm if you like) tall” or so to refer to an average person’s height.
I am not making claims on lack of precision of imperial system or so, but lack of consistancy in each of the units within the imperial system.
For scientific computing, its for convenience to see everything in powers of 10. Maybe not the computation itself but let’s say Planck’s constant in a totally different unit would look completely unknown if its not a change in factor of power of 10.
And why is that? I think its because its much more consistant, well formed and simple enough that one can identify how long a kilometer is only by knowing how long a meter is.
a_wild_mimic_appears@lemmy.dbzer0.com 2 weeks ago
I just want to add regarding the “common people, everyday life” stuff: the common people in the rest of the world just use metric in everyday life (with the precision that is useful for the context, body height is normally communicated in 10cm steps - 160, 170, 180 and so on), and it has the additional benefit that the rest of the world still knows what the fuck we are talking about.