Hacker Newsnew | comments | show | ask | jobs | submit login

It is missing hardness units: http://en.wikipedia.org/wiki/Shore_durometer http://en.wikipedia.org/wiki/Brinell_hardness

Also roofers commonly refer to a square of shingles:http://wiki.answers.com/Q/How_many_square_feet_will_a_square...




Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | DMCA | Apply to YC | Contact

Search: