## A Closer Look at the Meaning of Dimensions

**Understanding Dimensions**

All of us have a notion of dimensions. We measure the number of kilometers we jog, give appropriate price to a piece of land, and are recommended to drink at least 8 glasses of water a day. In talking about these things, we talk about dimensions. In determining the number of kilometers we jog, we measure *length. *The price of land is based on its *area* and other factors. In counting the number of glasses of liquid we drink, we are talking about *volume*. Length, area, and volume are examples of measurements in 1, 2, and 3 dimensions.

In mathematics, a dimension (of a space or object) is the least number of coordinates needed to specify a point within it. For example, on the number line, which is 1 dimension, we only need one number to determine a point. The number 5 corresponds to the point that is 5 units to the right hand side of 0. » Read more