 that is, some values are larger and some are smaller.</li>
<li><em>Equal intervals</em>: Units along the scale of measurement are equal to one another. This means, for example, that the difference between 1 and 2 would be equal in its magnitude to the difference between 19 and 20.</li>
<li><em>Absolute zero</em>: The scale has a true meaningful zero point. For example, for many measurements of physical quantities such as height or weight, this is the complete absence of the thing being measured.</li>
</ul>