Pronunciation: /dɪˈmɛn ʃən/ ?
A dimension is an extension in a particular direction. A line
has one dimension, since it extends in only one direction.
A two dimensional
has two dimensions. An x-y
is two dimensional. The x-axis defines one dimension and the y-axis defines another.
A dimension is not necessarily
A dimension may also be temperature, time,
mass, electrical current and others. For example, an equation may relate time and temperature:
p = 2.5t where p represents temperature and t represents
time. In this equation, one dimension is time and the other dimension is
special theory of relativity deals with four dimensions: three dimensions are lengths
making up a space, and one dimension is time. See also
An object is said to be dimensionless if it has no dimensions.
The only object in most geometries that is dimensionless is a
||A point has no dimensions.|
||A line has one dimension.|
||A two-variable Cartesian coordinate system has two dimensions.|
||A rectangle has two dimensions (length and width).|
||A circle has two dimensions (length and width).|
||A sphere has three dimensions (length, width, and height).|
||A rectangular solid has three dimensions (length, width, and height).|
|Euclidean space has four dimensions (length, width, height, and time).|
|Table 1: Dimensions|
- McAdams, David. Space. allmathwords.org. Life is a Story Problem LLC. 2009-03-12. http://www.allmathwords.org/article.aspx?lang=en&id=Space.
- McAdams, David. Dimensional Analysis. allmathwords.org. Life is a Story Problem LLC. 2009-03-12. http://www.allmathwords.org/article.aspx?lang=en&id=Dimensional%20Analysis.
Cite this article as:
Dimension. 2010-01-23. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/d/dimension.html.
2010-01-23: Added "References" (McAdams, David.
2009-11-22: Added manipulatives. (McAdams, David.
2008-07-11: Added table of dimensions (McAdams, David.
2008-07-07: Corrected spelling errors (McAdams, David.
2008-05-07: Added discussion of non-length dimensions (McAdams, David.
2008-03-10: Initial version (McAdams, David.
2008-01-28: Added link to Albert Einstein biography (McAdams, David.