# Mathematical Objects: Pencil

A conversation about the mathematics of chemistry inspired by a pencil, plus a chat about approximation. Presented by Katie Steckles and Peter Rowlett.

• #### Katie Steckles

Publicly engaging mathematician, Manchester MathsJam organiser, hairdo.
• #### Peter Rowlett

Peter Rowlett teaches mathematics at university. His column at The Aperiodical is Travels in a Mathematical World.

### One Response to “Mathematical Objects: Pencil”

1. Oliver

Love the podcast, and thanks for finally teaching me what a mole is.

However I think you’ve used ${\pi d^2}$ instead of ${\pi r^2}$ for area, which would make calculations off by a factor of 4 ish? That might push it into a different order of magnitude.