this post was submitted on 25 Jun 2025
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xkcd #3106: Farads (imgs.xkcd.com)
submitted 10 months ago* (last edited 10 months ago) by xkcdbot@lemmy.world to c/xkcd@lemmy.world
 

xkcd #3106: Farads

Title text:

'This HAZMAT container contains radioactive material with activity of one becquerel.' 'So, like, a single banana slice?'

Transcript:

[Cueball holds a stick while talking with Megan and White Hat.]
Cueball: This stick is one meter long.
Megan: Cool.
White Hat: That's a nice stick.

[Cueball holds a smallish rock.]
Cueball: This rock weighs one pound.
Megan: I'd believe it.
White Hat: Looks like a normal rock.

[Cueball holds a small battery.]
Cueball: This battery is one volt.
Megan: Seems fine.
White Hat: Might need a recharge.

[Cueball holds a capacitor while Megan and White Hat panic.]
Cueball: This capacitor is one farad.
Megan: Aaaaa! Be careful!!
White Hat: Put it down!!

Source: https://xkcd.com/3106/

explainxkcd for #3106

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[–] Hamartiogonic@sopuli.xyz 13 points 10 months ago (4 children)

But why pick one pound? The are so many fun units to choose from, only some of which are conveniently sized. How about a stick 1 mile long, or a rock that weights 1 grain?

[–] Simplicity@lemmy.world 26 points 10 months ago

A rock that weighs one stone (14 lbs).

[–] modeler@lemmy.world 9 points 10 months ago (1 children)

Or a barleycorn that's one barleycorn long? Or a really large foot that's a foot long. Or a chain that's a chain long?

[–] Wolf314159@startrek.website 1 points 10 months ago (1 children)
[–] modeler@lemmy.world 2 points 10 months ago* (last edited 10 months ago)

That's 2376 barleycorns, or a small bag of grain if you will.

[–] bizarroland@fedia.io 2 points 10 months ago (1 children)

I bet it's kind of going off of the original SI representation where, like, a foot was the length of the king's foot, and that was what they had to measure against to make sure everything was accurate.

[–] Swedneck@discuss.tchncs.de 2 points 10 months ago (1 children)
[–] Hamartiogonic@sopuli.xyz 1 points 10 months ago

Imagine what it’s like to calibrate an instrument like that.