What is Lead?
Lead, in the context of pencils, is a bit of a misnomer. When we say “lead” in this context, we’re not referring to the metal lead (Pb on the periodic table), which is heavy and toxic. Instead, we’re referring to the substance inside a pencil that makes marks on paper. This pencil “lead” doesn’t contain any lead metal at all.
Properties of Pencil “Lead”
Some of the common properties of pencil “lead” are:
- Composition: Pencil “lead” is a mixture of graphite and clay. The ratio of graphite to clay determines the hardness of the lead.
- Color: Pencil leads come in various shades of gray, from light to dark, depending on the amount of graphite used in the mixture.
- Hardness: Pencil leads vary in hardness, from very soft (e.g., 6B) to very hard (e.g., 9H). Softer leads create darker marks, while harder leads produce lighter marks.
- Uses: Pencil leads are used for writing and drawing. The hardness of the lead can be chosen based on the desired mark quality, from soft and dark for artistic sketches to hard and light for technical drawings.
Difference Between Graphite And Lead
Graphite and lead are two of the most common materials used for creating marks on paper or other surfaces when writing or drawing. Despite their frequent association, these materials possess distinct properties and serve different purposes. Graphite, often found within the core of a pencil, and lead, a somewhat misleading term historically associated with pencil cores, have confused many. This article aims to clear that confusion.
In this comprehensive guide, we will learn the differences between graphite and lead, including their structure and properties.