Size vs Dimension: The Differences

Dimension and size are two words that can be easily confused.

Size vs Dimension

Dimension is a measurement, while size is the amount of space an object takes up. If you want to know how big something is in inches, then you need to find out what its size is. However, if you want to know how long or wide it is, then you need to find out what its dimensions are..

Two objects can be equal in size but not in dimensions (height, width, depth). For example: A square piece of paper has more height than width whereas a circle has an equal amount of length and width. In this case the square would have less surface area because it takes up more space than the rectangle or circle.

What is dimension?

  • Dimension is a three-dimensional space that can be measured in length, width, and height. Dimension is the extent of something in a given direction. It’s one of the basic measurements that can be used to identify and quantify an object or space.
  • The fourth dimension is time. It’s so difficult to imagine, but people have tried for centuries. Even Albert Einstein said that “time is what happens when nothing else does.”
  • Dimensions are used to measure the size of objects or spaces.
  • A square has four dimensions because it has length, width, depth (or thickness), and height.

Examples: A cube with six dimensions

What is size?

  • Size can be measured as length, width, height, diameter, perimeter, area, volume, or mass.
  • The size of an object can be measured in inches, feet, meters and kilometers 
  • It could also refer more specifically to how large something is as opposed to its shape. Some people use the term “size” to refer to how well something fits them.

Examples: size of a room, clothing size

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