Some pencil's are filled with lead, but rarely any nowadays. Pencils use to be filled with lead, but now pencils are typically filled with graphite as lead is poisonous to humans.
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No, pencils are not filled with lead. They are filled with a mixture of graphite and clay. The "lead" in pencil terminology refers to the graphite core inside the pencil.
A typical lead pencil does not actually contain lead. The "lead" in a pencil is made of graphite, which is a crystalline form of carbon. Therefore, there is 0% lead in a lead pencil.
A 9mm pencil lead is thicker than a 7mm pencil lead.
It is called a lead pencil. Despite the name, the "lead" in pencils is actually made of graphite, not lead. Lead pens are typically mechanical pencils that use a lead refill.
A mechanical pencil would likely float in water due to its lightweight and buoyant materials such as plastic and metal components. However, if the pencil is filled with enough heavy lead to outweigh its buoyancy, it may sink.
No, pencil lead (graphite) is not magnetic because it does not contain any magnetic properties. Pencil lead is made of graphite, which is a form of carbon and is not attracted to magnets.