Editing Physical quantity (section)

=== Vectors ===
{{main|Vector quantity}}

[[Vector (mathematics and physics)|''Vectors'']] are physical quantities that possess both magnitude and direction and whose operations obey the [[axioms]] of a [[vector space]]. Symbols for physical quantities that are vectors are in bold type, underlined or with an arrow above. For example, if ''u'' is the speed of a particle, then the straightforward notations for its velocity are '''u''', <u>u</u>, or <math>\vec{u}</math>.