this post was submitted on 06 Sep 2025
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xkcd #3138: Dimensional Lumber Tape Measure

Title text:

A person with two watches is never sure what time it is, especially if I got them one of the watches.

Transcript:

Transcript will show once it’s been added to explainxkcd.com

Source: https://xkcd.com/3138/

explainxkcd for #3138

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[–] valkyre09@lemmy.world 2 points 1 month ago (1 children)

Maybe I’m being daft (I probably am).

After wood is planed and dried, I thought it would have gotten smaller.

In the image, 9CM lumber measurement is smaller than 9CM metric. Meaning when 9CM lumber shrinks it’ll be even smaller than the 9CM metric.

Have I got this backwards?

[–] TempermentalAnomaly@lemmy.world 7 points 1 month ago (1 children)

The joke is when you purchase a 2x4, it measures 1.5x3.5 and not the advertised 2x4.

[–] valkyre09@lemmy.world 4 points 1 month ago

lol, learn something new every day!