what is measurement?

Measurement is the process of quantifying attributes of an object or event, which can be used to compare with other objects or events. It is fundamental to the sciences, engineering, construction, and other technical fields. Measurement involves associating numbers with physical quantities and phenomena. The process of measurement begins with a definition of the quantity that is to be measured, and it always involves a comparison with some known quantity of the same kind. Measurements may be made by unaided human senses, in which case they are often called estimates, or, more commonly, by the use of instruments, which may range in complexity from simple rules for measuring lengths to highly sophisticated systems designed to detect and measure quantities entirely beyond the capabilities of the senses. The science of measurement is pursued in the field of metrology. The measurement of a property may be categorized by the following criteria: type, magnitude, unit, and uncertainty. There are some basic types of measurement variables that we deal with in several areas of mathematics, such as time, length, weight, and capacity or volume.