this post was submitted on 21 Jan 2024
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[–] [email protected] 100 points 7 months ago (1 children)

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

[–] [email protected] 5 points 7 months ago* (last edited 7 months 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 7 months ago (2 children)

I have no idea if this is meterhertz or millihertz

[–] [email protected] 13 points 7 months ago
[–] [email protected] 6 points 7 months ago* (last edited 7 months 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 7 months ago (4 children)

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

[–] [email protected] 9 points 7 months ago* (last edited 7 months 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

[–] [email protected] 6 points 7 months 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

[–] [email protected] 4 points 7 months 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 7 months ago* (last edited 7 months 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 7 months ago

Millihertz are used for gravitational waves in Astrophysics.

[–] [email protected] 13 points 7 months ago (1 children)

Pretty sure kilo is lowercase, actually.

[–] [email protected] 4 points 7 months ago (1 children)

Son of a bitch, you’re right lmao

[–] [email protected] 3 points 7 months ago (1 children)

Big K is Kelvins for temperature

[–] [email protected] 3 points 7 months ago (1 children)
[–] [email protected] 4 points 7 months ago

Sufficient Kelvins do hurt, I guess

[–] [email protected] 4 points 7 months 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 7 months 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.

[–] [email protected] 2 points 7 months ago (4 children)

Can Hertz be imperial or are they strictly metric?

[–] [email protected] 9 points 7 months 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 7 months ago

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

[–] [email protected] 4 points 7 months ago* (last edited 7 months ago)

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

[–] [email protected] 3 points 7 months ago* (last edited 7 months 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 7 months ago* (last edited 7 months ago) (1 children)

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

[–] [email protected] 5 points 7 months ago
[–] [email protected] 21 points 7 months ago (1 children)
[–] [email protected] 12 points 7 months ago

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

[–] [email protected] 9 points 7 months ago (1 children)
[–] [email protected] 8 points 7 months ago

but what is that in parsecs

[–] [email protected] 7 points 7 months ago* (last edited 7 months 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 7 months ago

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

[–] [email protected] 3 points 7 months ago* (last edited 7 months ago)
[–] [email protected] 2 points 7 months ago

❌ mid/side
✅ millihertz