Assertion: pencil's strength | /r/CapableOf | go up with the cube of the diameter
Facets:
value: at a first approximation
type: MANNER
Source sentences:
text: I’ll spare you the math, but at a first approximation the strength of the lead goes up with the cube of the diameter, so according to the simple model I used (I make no claims to either accuracy or precision) it takes something like 6 times as much force to break a 0.9mm lead as a 0.5mm.