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The graphite in pencils is mixed with clay during fabrication of the "lead" to help hold its shape, and would only burn at greater than 1,000 °C (1,832 °F). [ 10 ] The quantity of graphite particles actually produced during occasional writing would be too small to constitute an electrical hazard.
Although a common classroom experiment is often explained this way, [440] Bernoulli's principle only applies within a flow field, and the air above and below the paper is in different flow fields. [441] The paper rises because the air follows the curve of the paper and a curved streamline will develop pressure differences perpendicular to the ...
Derwent colour pencils have traditionally been sold in tins of 12, 24, 36 and 72 different colours. They are also available in a range of wooden presentation boxes or sets of six which are intended to be trial packs. Derwent's oldest line of colour pencils, Artist, were expanded from a range of 24 to 72 in 1939 and from 72 colours to 120 in 1996.
Two graphite pencils. Both are labelled "HB", but the numeric label differs between "2" and "2 1 ⁄ 2 ". A grading chart ranging from 9B to 9H. Graphite pencils are made of a mixture of clay and graphite and their darkness varies from black to light grey. A higher amount of clay added to the pencil makes it harder, leaving lighter marks.
It stems from γράφειν ("graphein"), meaning to write or draw in Ancient Greek. [14] [57] From the 16th century, all pencils were made with leads of English natural graphite, but modern pencil lead is most commonly a mix of powdered graphite and clay; it was invented by Nicolas-Jacques Conté in 1795.
The graphite in mechanical pencils is typically much narrower than in wooden pencils, frequently in sub-millimeter diameters. This makes them particularly useful for fine diagrams or small handwriting, although different sizes of refill leads cannot be interchanged in the same pencil unless it has been specially designed for that purpose.
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