A map is a two-dimensional surface which has length and width. The north-south axis provides one perpendicular reference line, usually called the y-axis. The east-west axis provides the second perpendicular reference line, usually called the x-axis. Using these two axes, every point on the surface can be uniquely identified with two numbers, x and y. A map is two-dimensional because it takes two numbers to uniquely specify any point. An important use for vectors is for navigation, which involves using maps to know where you are, and to plan and carry out movements.
Is density an example of a vector or scalar quantity?
 |
Density is an example of a scalar quantity. It lacks direction. It is also the product of mass and volume, both scalar quantities. 
| |
A 
