Length3.2 hundredths m
58,182Green light wavelengths
453 millionthsBoeing 747 lengths
3.2 thousandthsFire engine lengths
31.8 mm; 4 studs x 8 mm pitch
The world's least useful encyclopedia

Photo by Xavi Cabrera on Unsplash
The 32mm building block of childhood dreams and parental nightmares/Everyday Objects
The classic 2x4 LEGO brick has remained virtually unchanged since 1958 and is manufactured to a tolerance of 10 micrometers. A 1958 brick will still snap perfectly onto one made today. There are approximately 915 million ways to combine six 2x4 bricks, and stepping on one barefoot generates a pain roughly equivalent to being judged by your childhood self.
31.8 mm; 4 studs x 8 mm pitch
15.8 mm; 2 studs x 8 mm pitch
11.5 mm including the stud top
2.31 grams of ABS plastic
Force needed to separate two 2x4 bricks; surprisingly high
Can support ~432 kg before failing; ~375,000 bricks stacked