Are metric measurements like decameters and hectometers ever used?
I've learned about them in school, but I've never heard anyone say something is 8 decameters long or anything like that. I'm an American.
I've learned about them in school, but I've never heard anyone say something is 8 decameters long or anything like that. I'm an American.
They are "technically correct" measurements since they are a valid prefix, and could be used if you wanted. but they are very infrequently used in any industry. Since most of the time measurements are better served by higher precision (just using Meters) or need no precision at all over long distance (switch to kilometers), no need for excess measurement types unless necessary
Well he asked about deca and hectometers, which are all larger-than meters.
But the same kind of rules apply below the decimal point as above it. We have millimeters (0.001 extreme precision), centimeters (0.01 high precision), and meters (1 low-ish precision). Decimeters (0.1) exist but are rarely used since both meters and centimeters can get the same result. Micro meters and nanometers are also used more frequently, but it becomes industry specific when actually doing things that small.
Centimetres and meters are the two I use the most and see the most used, then kilometres at a close third.
Valid, but rarely used, as it's usually just as fast to say "two hundred meters" instead of "two hecto meters".
However, those prefixes have other (non-SI) uses. A hectare is common way of referring to a 100x100 meter area. And a decare is 10 ares, i.e. 0.1 hectare.
For distance, no. Day to day we use mm, cm, m and km. But in more specialised settings (e.g. construction) I've seen sometimes decameters.
For weight yes, grams, hectograms, kg, tons. Liquids is usually ml, cl, liters, hectoliters (not sure it's spelt that way).
In labs I've also seen also micro and nano of all three units.
Use cubes for water. Short for cubic meter. That is 1 meter by 1 meter by 1 meter which is also exactly 1000 liters.
This is one of the convenient metric parameters where they made an easy conversion allowing you to precisely use distance to calculate volume.
No, some measurements just aren't used, even when they'd be a good fit.
Like lengths. We never use anything above km. Even for things like space, we say "million km" rather than gigametre.
The closest we come to hectometre is hectare, which is used for land area.
I'd say we use every 3 prefixes, nanometerw, micrometers, mm, m, km, than any much higher than that usually uses space units (parsecs, AU, lightyears, etc.)
Where do you live and what is your profession? I have heard anyone use megameter seriously.
My astrophysicist friend used them sometimes. I knew her in Texas. She's moved around tho
In The Netherlands we actually use “hectometerpaaltjes”, which translates to hectometer-signs. They are numbered signs placed on regional roads and highways every 100 meters, which is a hectometer. Although not a direct use of measurement, the term hectometer still is in active use this way.
In France "hectare" (10 000m²) is used for fields and burning forest. Beside that deca or hectometers are never used
As an American who has gotten very used to metric units in studying engineering, the general rule I picked up is that you typically only change units every three orders of magnitude. So 8 decameters would typically be expressed as 80 meters, maybe 0.08 kilometers. Decameters and hectometers are a thing, but they're not common units. Even centimeters don't see much use compared to millimeters.
We usually go for the 3 order rule, but in the case of areas and volumes, for dimensional reasons, dam and hm make it into the three order rule. Dm (or dam) is not common but dam^3 has some uses, the same goes for hm, hm is used for only special situations (like meassuring train distances), but hm^2 is almost globally used for big chunks of land. Also, with hm^2, we always keep the unit, so for example, Parque Nacional Iguazú in Argentina has 67620 hm^2 (also ha or hectarea).
I'm also an engineer and I generally despise imperial units, but I have to say that inchs are pretty handy and the 1 in = 25,4000... mm relation is pretty neat
From my experience in Norway, these are typical in context of daily speech:
Weight (gram): tonne (a substitute name for Mg (Mega)), kg, hg, g, mg, μg (mostly in medicine)
Distance (meter): mil (10 km), km, m, dm (kinda rare), cm, mm
Volume (liter): l, dl, cl, ml
In my experience, the deca-predix is very rarely used. Most of the missing prefixes are just substituted for numbers, i.e. saying "a thousand kilometers" is much more common that "a megameter". Of course, this differs depending on context, as a lot of the prefixes become more common within scientific fields where the sizes are common.
On a separate note, even the numbers can be a bit inconsistent. It has bothered me that it's often common to say "a thousand milliard" instead of "one billion" (also note that we use the long scale).
In Germany Hectoliter is also used to calculate beer volume in commercial settings, like planning for a bar or a festival.
From my experience in Norway, these are typical in context of daily speech: (...) km, m, dm (kinda rare), cm, mm
Don't forget the Scandinavian mile! You and the Swedes use it all the time.
It depends on the situation, sometimes they are really handy but most of the time we stick to kilo, centi and mili.
Where i live, Hecto (100x) is used, for example to measure distances and areas for big properties. 1 hectometro equalls 100 m, or 1 hectarea (hm^2) equals 10000 m^2.
Also, it is widely use for pressure, cause 1 atm is 1013 hPa
Decameters are used but for special situations, like quantifying natural gas consumption
No, volume dimensions are independent of what a specific volume is filled with.
1 liter of water is 1 cubic decimeter of water just as 1 liter of air is 1 cubic decimeter of air.
Decimeter is used in older American botany books for some reason. Only place I've ever seen it
Yes, they are used, but typically in specialized applications which is why you don't see them every day.
In America, I've seen nurses and diabetics use deciliters in reference to medication or concentration before.
Deci is 0.1 and that gets used frequently, deka is 10 and never gets used at all, except in Austria when grocery shopping at the deli counter. 🤷
Hekto is 100 and similarly never gets used, not even by Austrians.
Deciliters are not infrequently used in recipes here as well. I've never seen decameters or hectometers used by anyone.
In Italy we use hectograms ("ettogrammi", "etti" for short) in day to day life when buying groceries. You don't ask for 200 grams of ham, you just ask for 2 etti.
Thinking how I always order deli meat in units of 100 grams, feels dumb we don't do that in Canada too
Yeah I don't think it's very common elsewhere. Right over the border with France they were already saying "200 grams de jambon".
But I think it's convenient. Small number make brain hurt less, brain no need to think.
In Poland: decimeters are sometimes used (I have been ordering cut sheet metal priced by square decimeters) , I have not seen decameters in use. Hectopascales are often used in weather reports. Decagrams are often used when buying food where these amounts make most sense (meat, candy).
The 'more exotic' prefixes are usually only used with some specific SI units and in very specific contexts.
In Romania we use them for measuring areas. An "ar" is 100m^2 or a square decameter, and a hectare is a 10000m^2 or a square hectometer.
In metric units, we primarily use the x1000 or x1/1000 steps, with a few notable exceptions. We use the centimeter (1cm = 1/100m) quite commonly, the centiliter (1cl = 1/100l) is also relatively common with drinks, and, IIRC, the Austrians use the deka, short for decagram (1dg = 10g).
And hectograms. We just shorten it to ”hekto” though. It’s how we buy stuff from the deli. ”2 hekto salami please”.
Sweden is also the only country in the world to have a sensible use of the word 'miles' (or 'mil' in Swedish):
10km = 1 mil
They use this a lot when speaking of travel distances longer than 20km.
I'm American, but follow mostly Europeans and Canadians online and use metrics in my own head just because it makes more sense.
I gather that the deca-/deka- and hecto- (along with a few other) prefixes are similar to imperial furlongs, leagues, stones, barrels, kegs, and hogsheads: They exist, but no one uses them outside of very specialized circumstances.
I think the point op is making is with 'stones' or 'furlongs' etc you need to already know what that unit represents to make sense of it.
With metric units, even the infrequently used increments can be reasoned out just from the name of the unit, as it's a standard prefix in fixed multiples of 10, not a random number that must be learnt.
So they're neither similar or exactly the same in principle really.
In fairness, you also need to already know what grams, meters, and seconds represent. And the prefixes are hardly self-explanatory. You’d still have to look up the unfamiliar ones. Just like you have to look up nautical miles or knots.
Well with metric there are alot less words you need to know to use them I think is the point of difference.
Like you need to know that a stone represents a weight, and that that weight is 14 pounds. What's a pound? Oh it's 12 ounces. None of those words are the same out of context but all describe a weight and the size of the weight.
In metric you only need to know that grams measure weight, metres length, litres volume. Then everyday use is normal prefix increments like OP said.
And again the prefixes apply consistently across units too, so a millimetre, a millilitre or a milligram will all be the same fraction of their base.
It seems that we're both fans of SI units. I'm not arguing against metrics. But you still have to know what the words mean, and to do that, you have to look them up. You can also look up deebles if necessary.
And not to pick nits, but grams measure mass, not weight. Weight is newtons. A pound is 16 ounces, not 12. A lot of the measures, such as weights and volumes, use powers of two: 2, 4, 8, 16, 32, 63, 128.
It's easy to get imperials confused. That's why I'd rather call a pound about a half kilo in my head and be done with it.
Haha, I promise I didn't intentionally make my point about how obscure imperial units are in conversion. I looked it up but clearly transcribed wrong!