Question

What is the need for measurement of a physics quantity?

Answer 1

Hint: Think this yourself, what is going to be the meaning of length of an object if we cannot measure it. We will then inform its length subjectively as ‘long’, ‘short', etc. That makes no sense any more now.

Complete step-by-step answer:
Measurement is the process by which we measure a physical quantity using a specified instrument for that quantity. In technological know-how and engineering, we carry out experiments. We should take readings during experiments. Therefore, a few measures are needed for these types of experiments. During the manufacturing of mechanical products, we ought to grade the components so as to locate whether or not the part is made as in line with the specifications. Thus, measurements are essential for manufacturing and quality control.

By measuring a physical quantity, we outline the properties of a material which the physical quantity is related with.

Physical quantities are the substances which can be measured. By measuring physical quantities, we are able to measure the mass, weight and different physical properties for example, distance, speed, mass, pressure, force, momentum, energy.

Note: A physical quantity is a property that can be quantified by measurement of a material or system. A physical quantity may be represented as the combination of a unit and a numerical value. For example, by specifying methods for calculating them, we outline distance and time, while we describe average speed by stating that it is measured as travelled distance divided by travel time. Measures of physical quantities are represented in unit units, which are numerical meanings. For e.g., the duration of a race may be measured in units of meters or kilometers and is a physical quantity. Without uniform units, scientists will consider it incredibly difficult to explicitly and significantly evaluate measured values.