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Earth now weighs six ronnagrams: New metric prefixes voted in

phys.org

191–200 of 215 posts

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#191

Earlier quoted context omitted.

Byte, as per ISO/IEC 80000 (which includes SI in the Part 1).

Byte's not a prefix. Is it a problem for anyone when millimeters are written "mm"?

Units can be multiplied though. If N were a prefix you couldn’t distinguish Newtonmetres from N many metres

I think older prefixes are just grandfathered in

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#192
post #189

Earlier quoted context omitted.

Weight in relation to what? The Earth sits in the void of space, it is like a free falling apple.

Agree with Earth’s “weight”, disappointed a physics website would make such a silly error! > void of space, it is like a free falling apple falling where in space??? =p ;)

Everything is relative :)

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#193

Earlier quoted context omitted.

If only some governing body had been aggressive enough to redefine NTSC 60Hz as actually 60 fps.

It was 60fps. Color required an adjustment to prevent stationary artifacts.

Right, but they should've put in the work to redo things back then so we wouldn't have to deal with stupid refresh rates now lol

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#194
post #99

Pretty nice table here: https://en.wikipedia.org/wiki/Metric_prefix "(...) he had the idea for the update when he saw media reports using unsanctioned prefixes for data storage such as brontobytes and hellabytes. (...)" and "The only letters that were not used for other units or other symbols were R and Q" So it seems the new prefixes are partly initiated by the exponential computer storage needs rather than scientif…

Do we need to have a single letter? Is it acceptable to combine prefixes? Eg: 1 QB (quettabyte) == 1,000,000 YB (yottabytes) == 1 MYB (mega-yottabyte) Without the new prefixes, we could have gone to 1 YYB (1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000, or 10^48 bytes)

SI prefixes could originally be combined like that: it was perfectly fine to say one hectokilometre. Such usage is now deprecated, though. You'd have to say 0.1 megametre instead.

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#195
post #68

Earlier quoted context omitted.

Many natural languages have grouping at every three digits in a decimal number, but it's not universal. Like in English 10000 is ten thousand, there is no new single word for it. IMO most of it is momentum and convention, there is nothing inherently natural about grouping by every 3 digits.

Technically there is a word for 10 000: "myriad". But nobody uses it like that anymore...

I've been guilty of using not only permille but also permyriad (‱) in certain work where it made sense …

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#196

A question... Why do humans (or at least engineers) work so well in 1,000? I mean. I use milli/micro/nano/pico as an electrical engineer every day, and it's so intuitive to me. But why three orders of magnitude? Why not two orders, or five?

Percentages lack sufficient granularity. Permillages would do the trick.

Blood-alcohol levels are typically measured as permilles in some countries, like Sweden. 0.2 ‰ is the legal limit there. Also used in some countries in Europe to denote the grade of slopes (as in warning for steep hills).

Never seen permyriads, though.

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#197
post #67

So RB and QB for ronnabyte and quettabyte? What system could be described at that scale? Does Google store quettabytes of data? Considering Seagate is shipping only 155EB (=0.000000000155QB) of storage per quarter[0], reaching the QB scale seems a way off. [0] https://www.forbes.com/sites/tomcoughlin/2022/08/21/c2q-2022...

Data xfer'd vs. data stored.

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#199

> the Earth weighs approximately six ronnagrams This is from a Physics forum? Really? No! The Earth does not have weight! It has mass. Weight is a force. It is a function of gravitational pull between two masses. If you want to talk about force you have to use Newtown's Law of Universal Gravitation: F = (G * m1 * m2) / r**2 You could speak in terms of gravitational pull between the earth and the moon or any other obj…

It is very important to distinguish the 2 physical quantities whose standard names are now "force" and "mass", but it is debatable whether it was good choice to arbitrarily assign to the word "weight" the meaning of a force and to establish the new word "mass" (new with this meaning) for what is now called "mass".

The word "weight" and its equivalents in other European languages, e.g. "poids", "pondo" etc., have been used for thousands of years principally to name the quantities measured by weighing with a balance, which are masses, not forces, and only seldom and mostly metaphorically and non-quantitatively to refer to a force. By etymology, such words derive in one way or another from the operation of using a weighing balance, e.g. "pound" means "hanging", from hanging objects on the weighing scales.

The word "mass" has been used for thousands of years only with a meaning that had nothing to do with a measurable quantity, but only to name some amorphous piece of some material, such as dough, clay, soil, rubble.

A wiser choice would have been to name as "weight" what is now named "mass" and to use a name such as "force of gravity" for what is now named "weight".

Such a terminology would have kept the continuity with the traditional meanings of the words and would not have offered opportunities for the majority of the people, who even today continue to use those traditional meanings in colloquial language, to be corrected by those who have made an arbitrary choice to assign new meanings to old words.

Unfortunately there exists a very large number of scientific or technical terms whose meaning has been changed some time during the last few centuries, sometimes intentionally, due to questionable decisions, but in many times due to various errors or misunderstandings.

Even when such names reflect very serious errors of those who have coined them, their meaning can no longer be changed, as too much new literature has accumulated, which uses the new meanings.

Re: Earth now weighs six ronnagrams: New metric prefixes voted in

#200
Can someone ELI5 how you “weigh” the earth? Isn’t weight based off gravity? And gravity is relative to the mass of the object you are on, for example we say you would weigh less on the moon and more on Jupiter. So how exactly to you weigh a planet, and why would that even be useful? Do you assume some theoretical force and hypothetically place the earth on a scale and apply that force? When talking about planets isn’t mass a better way to measure and classify rather than weight?
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