A measurement is the number assigned to an attribute of an object or event that allows for a comparison between different objects and events. Examples include the numbers used to describe length, capacity, or weight. Measurements have long been necessary for trade, science, technology, and quantitative research.
the attribute that is being measured in the image below is length.
The unit of length in this case is centimeters. This measurement, like all other measurements, is approximate. For every unit of measurement, there is always a smaller, more precise unit that could be used.
There are many other kinds of measurements. Some of these are area, time, temperature, and angle.