Define measuring instrument and measurement system.

Measurement system: The procedure of measure a quantity is called the measurement system. 

Measuring instruments: The measuring instruments are used for measure the quantity. 

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Write down the methods of measurement and explain them.

The methods of measurements are classified into two categories- 

a) Direct methods and 

b) Indirect methods. 

Direct methods: In these methods, the unknown quantity is directly compared against a standard. The result is expressed as a numerical number and a unit. Direct methods are quite common for the measurement of physical quantities like length, mass and time. 

Indirect methods: These methods are apply in which measurement by direct method are not possible, flexible and practicable. This method includes always error in measurement.

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What is measurement? Explain the significant of measurement.

Measurements: The measurement of a given quantity is essentially an act or the result of comparison between the unknown quantity and a predefined standard. 

In fact, the measurement is the process by which one can convert physical parameters to meaningful numbers. 

In order that the result of the measurement is meaningful, there are two basic requirements: 

1. The standard used for comparison purpose must be accurately defined and should be commonly accepted and, 
2. The apparatus used and the method adopted must be provable. 

Significance of measurements: The importance of measurement is simply expressed in the following statement of ‘Lord Kelvin’: “I often say that when you can measure what you are speaking about and can express it in numbers, you know something about it; when you cannot express init numbers your knowledge is of a meagre and unsatisfactory kind.”

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