measurements

Measurements Definition

Our activities and actions are based on measurements. For example, when someone asked “what time is it?” We are referring to a form of measurements, in this case the time to know how long to get to a place or how long it will take to perform an activity. Many properties of objects and substances can be measured by their: mass , volume, temperature, etc. From this point of view, we can say that physics is the science that deals with, among other things, the study of the measurable properties that have the bodies.

In the study of physics it is necessary to use clear and precise language for describing a complete and concise manner of the phenomena studied. For example, to describe the fall of a body in space, a person who does not know this language would say the body was initially still and then began to fall more and faster. However, the idea conveyed by this explanation is very vague.

However, when it is said that the body falls with a constant acceleration of 9.8 m / s 2 , the people who knows the physical language has a clear idea of the movement.

What do we measure? Measurement is an important activity in our daily lives. Particularly in the study of science the measurement is a very important aspect. With better and more accurate the measurements, we can understand and describe the phenomena of nature more precisely.

The measurement is also a result of comparison, in order to discover their relationships or estimate their differences. For example, when we measure the length of an object, what we do is compare it to another object the length of which is accepted as a base unit for comparison.

If we use different objects as the basis of comparison for the measure, the results we obtain will be different. To prevent this scientists use patterns, which are international agreements for measures and provides the same results.

 Concept of Measurements

Measurement is to compare a magnitude with another of the same species, which is considered as a unit that is a certain unit secured by an agreement or convention.

According to the above, measurement is quantitatively comparing two objects, one of which is accepted as base unit and at the end expressing numerically possible outcomes.

     In scientific work measurements indicate two important classes of information:

  • The amount of the magnitude to be measured, reported as a number.
  • The unit in which the amount has been measured.

Therefore, we must never forget that by expressing an amount of any magnitude must include the unit used. If we use only a single number, as a result of a measurement, then it has no physical meaning. For example, 6 is wrong but 6 feet is true.

Measurements Pattern Concept

When we measure a quantity, what we do is comparing it to some benchmark. For example, when referring to a time interval 50 seconds, it indicates that the interval is 50 times greater than the time pattern called a second.

Therefore, a measurement standard unit of measure is established in international agreements.

Creating units of measure is based on agreements or conventions in fixing usually in an arbitrary, definitions of the patterns that serve to make comparisons or measurements. For example:

     A yardstick must have two characteristics:

  • Being reproducible
  • Being constant.

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