鉛筆h是什麼意思

"H" in pencil lead grades refers to "hardness." Pencils are graded on a scale that indicates the hardness of the graphite core, which affects the darkness of the mark and the amount of pressure required to make a mark. The scale typically ranges from 9H (hardest) to 9B (softest), with B pencils being darker and softer than H pencils.