this post was submitted on 21 Jan 2024
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all 35 comments
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[–] unlucky 100 points 1 year ago (1 children)

m•Hz ~ m/s with implied periodicity, mHz would be milliherz

[–] psud 5 points 1 year ago* (last edited 1 year ago)

To expand on that, 1 mHz would be 1 thousandth of a cycle per second/one cycle per thousand seconds

1m/s is about 3.6km/h or 2.237 mph

[–] [email protected] 63 points 1 year ago (2 children)

I have no idea if this is meterhertz or millihertz

[–] [email protected] 13 points 1 year ago
[–] TeckFire 6 points 1 year ago* (last edited 1 year ago) (4 children)

nHz is Nanohertz 1/1,000,000,000 Hz (Billionth)

µHz is Microhertz 1/1,000,000 Hz (Millionth)

mHZ is Millihertz 1/1,000 Hz (Thousandth)

Hz is Hertz 1 Hz (Base Unit, one per second)

kHz is Kilohertz 1,000 Hz (Thousand)

MHz is Megahertz 1,000,000 Hz (Million)

GHz is Gigahertz 1,000,000,000 Hz (Billion)

THz is Terahertz 1,000,000,000,000 Hz (Trillion)

I suppose there are probably more that I’m not aware of, but I hope this clears it up.

[–] [email protected] 25 points 1 year ago (4 children)

No, that absolutely does not resolve the confusion between meter (m) and milli (m)

[–] TeckFire 9 points 1 year ago* (last edited 1 year ago)

I feel like a dumbass

I totally read your comment as “Megahertz or Millihertz”

Now I realize it should just be Meters•Herts or m•Hz

[–] psud 7 points 1 year ago

Standing alone 'm' is metre.

With a decimal modifier ahead of it, 'm' is metre

Immediately before a symbol it is milli (one thousandth)

mm - the first m is before the metre symbol, it is the milli multiplier, the second m is after a multiplier, so it is the symbol for metre

mHz - the m is before the symbol Hz (for Hertz) so it is the milli multiplier

km - the m is after the K (kilo, thousand times) multiplier, so it is metre

You probably spell metre 'meter', but a meter is a whole different word in English

[–] unlucky 4 points 1 year ago

By convention, compound SI units (e.g. N•m) are separated by a space or multiplication dot and are not just smashed together. The lack of such a separator in the above example implies the "milli" prefix.

[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (1 children)

No one uses millihertz and neither meterhertz. If you want to do it correctly the first one would be acceptable for milli as scale. The second one would need to be written as m • Hz.

[–] [email protected] 5 points 1 year ago

Millihertz are used for gravitational waves in Astrophysics.

[–] [email protected] 13 points 1 year ago (1 children)

Pretty sure kilo is lowercase, actually.

[–] TeckFire 4 points 1 year ago (1 children)

Son of a bitch, you’re right lmao

[–] psud 3 points 1 year ago (1 children)

Big K is Kelvins for temperature

[–] TeckFire 3 points 1 year ago (1 children)
[–] psud 4 points 1 year ago

Sufficient Kelvins do hurt, I guess

[–] [email protected] 4 points 1 year ago (1 children)

All metric unit prefixes are possible. Like femtohertz, picohertz, centihertz, decihertz, decahertz, hectohertz, petahertz, zettahertz. Not sure if they are used often.

[–] [email protected] 2 points 1 year ago

Well Hz is a frequency per second. It doesn't make much sense to use them for low frequency things but it's still possible. Just most things that happen less than once per second are usually described in units like seconds, hours and more.

[–] frunch 2 points 1 year ago (4 children)

Can Hertz be imperial or are they strictly metric?

[–] [email protected] 9 points 1 year ago

I think there's something like 43/500ths of a Bigole Hertz to a regular Hertz; but that's if you're using English Bigoles. I think it's 43.9/500ths for a US Bigole.

[–] [email protected] 4 points 1 year ago* (last edited 1 year ago)

I'm American and I've never seen any other unit used for frequency unless you count adjectives like "daily".

[–] [email protected] 4 points 1 year ago

I usually just rent from Enterprise. They pick you up!

[–] psud 3 points 1 year ago* (last edited 1 year ago)

RPM (revolutions per minute) is an old rotational measure

But the second is the same in both systems so I wouldn't be surprised if America called revs per second "Hertz"

[–] [email protected] 24 points 1 year ago* (last edited 1 year ago) (1 children)

if you are going 100km/h north or south you are revolving around the earth at about 69μHz

[–] TheRealKuni 5 points 1 year ago
[–] fastandcurious 21 points 1 year ago (1 children)
[–] [email protected] 12 points 1 year ago

When you step on a Lego, you measure the pain in foot-hertz (only in America I guess)

[–] SirBucksworth 9 points 1 year ago (1 children)
[–] [email protected] 8 points 1 year ago

but what is that in parsecs

[–] LemmyKnowsBest 7 points 1 year ago* (last edited 1 year ago)

12-year-old me when Reading Rainbow guy started wearing a banana clip on his face, and I knew what it was because they had just come into style for girls hair accessories. 🧐

But 12-year-old me gave them the benefit of the doubt, surely it's just a coincidence, This thing that all my friends and I are wearing in our hair, surely Star Trek would not be using that on his face. Surely it must be something much more sophisticated & scientific to assist the blind somehow.

[–] [email protected] 4 points 1 year ago

Oh this hurts my brain. What have you exposed me to!

[–] mvirts 3 points 1 year ago* (last edited 1 year ago)
[–] [email protected] 2 points 1 year ago

❌ mid/side
✅ millihertz