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The SI system of numbers has k (or kilo) as the prefix for 1000, m (or micro)as the prefix for a millionth and M (or Mega) as the prefix for a 1,000,000. So that MHz is 1,000,000 Hz and mHz is 1/1,000,000Hz. See
Kilo.
Tiles06:31, 27 January 2005 (UTC)reply
Common usage has capital K for kilo in all sorts of scientific uses, to conform to a 'nonstandard' of capitals=greater, lowercase=lesser. I always thought the unit name spelled out was capitalised 'Hertz', but I was wrong. –
Rich22:16, 29 September 2005 (UTC)reply
To my knowledge, capital K is used in the binary system to indicate 1024. So kilobyte, Kb for short, is 1024 bytes, not 1000.
Sven De Coster— Preceding
unsigned comment added by
217.136.222.224 (
talk)
13:36, 18 April 2006 (UTC)reply
Hertz is capitalized in abbreviations such as kHz and MHz, as it is derived from a last name, but according to NIST standards is not capitalized when used as a primary unit, such as a unit of frequency. Only when the proper name is used as a modifier of the primary unit, such as degrees Celsius, is the name capitalized. Some corresponding corrections have been made to the page.
JM Dahl (
talk)
14:21, 9 January 2016 (UTC)reply
Assessment comment
The comment(s) below were originally left at Talk:Hertz/Comments, and are posted here for posterity. Following
several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
The rad/s to Hz conversion shown is confusing. It would be clearer to write:
1 rad/s = 2π Hz, or 1 Hz = (1/2π) rad/s,
where as usual the units follow the numerical measures.
(I tried to edit the article, but my command of the syntax wasn't good enough.)
Last edited at 19:46, 25 July 2007 (UTC).
Substituted at 17:51, 29 April 2016 (UTC)
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The bottom light should blink with 2 Hz, but one full on-off cycle takes 1 second, so it is actually 1 Hz. The definition of Hertz is for full cycles, not half cycles, so while it is true that the light is on for 0.5 seconds, that doesn't make the frequency 2 Hz.
130.75.213.44 (
talk)
10:53, 24 February 2021 (UTC)reply
This week the gif creator again added a gif that has wrong speeds. So I replaced it with the old image that was used until July 2020. It is used on numerous pages.
63.226.236.153 (
talk)
09:19, 24 February 2022 (UTC)reply
"one per second" is a very awkward phrase that is not implied by "1 s-1" and that makes the reader ask "one what?" "Cycle" is appropriate because Hertz is a unit of frequency and cycle is a generic term for whatever is repeating that has a frequency. "Cycle per second" is also the standard dictionary definition. "1 s-1" is not a definition but an SI equivalent, as shown in the infobox.
Danstronger (
talk)
17:12, 30 December 2021 (UTC)reply
Four points:
It would be correct to say that the numerical value of frequency, when expressed in hertz, is equal to the number of cycles per second, but that statement does not make the cycle a unit. Standardization bodies like BIPM and NIST do not mention the "cycle" and instead state that 1 Hz is equal 1 s^-1. In a sloppy kind of way it's OK to say they are the same, but sloppiness is not what I seek in an encyclopaedia. We should be precise.
It hasn’t always been that way. There was a time when “cycle per second” (cps) was considered a unit, complete with kilocycle per second (kcps), megacycle per second (Mcps) and so on. But such units are obsolete and the article should make that clear.
"One per second" is precisely what is meant by 1 s-1 (in the same way that "one metre" is meant by 1 m). What else would it mean?
It’s clear to me that Boppennoppy is trying to improve the article, making changes that are substantiated by reference to international standards. I understand your point of view as well (though I do not agree with it), but just because you are in a majority does not make you right. I suggest we seek a form of words that acknowledges both the precise definition (citing BIPM and
NIST), and the sloppy one (citing whichever sources you consider appropriate).
I know it's not exactly what you wanted but I added a sentence about hertz being an SI derived unit (which I agree is important) to the lead. I think it's important to distinguish between a definition, which is explanatory English, and an "expression in terms of SI base units" which is the column heading in the NIST reference. Both have their virtues, but "cycle" is part of the definition, even if it's "not a unit", and I think it's correct for the article to start with a definition.
Danstronger (
talk)
18:52, 30 December 2021 (UTC)reply
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