# Introduction To Engineering Metrology -Types Of measurements

**Need for Measurement **

- to ensure that the part to be measured conforms to the established standard.
- to meet the interchangeability of manufacture.
- to provide customer satisfaction by ensuring that no faulty product reaches the customers.
- to coordinate the functions of quality control, production, procurement & other departments of the organization.
- to judge the possibility of making some of the defective parts acceptable after minor repairs.

__Methods of Measurement __

__Methods of Measurement__

__1) Method of direct measurement:__

__1) Method of direct measurement:__

**Weight of a substance is measured directly using a physical balance.**

__Example :____2) Method of indirect measurement: __

__2) Method of indirect measurement:__

**Weight of a substance is measured by measuring the length, breadth & height of the substance directly and then by using the relation**

__Example :__**= Length x Breadth x Height x Density**

__Weight____3) Method of measurement without contact:__

__3) Method of measurement without contact:__

__4) Method of combination measurement closed series:__

__4) Method of combination measurement closed series:__

__5) Method of fundamental measurement:__

__5) Method of fundamental measurement:__

__6) Method of measurement by comparison:__

__6) Method of measurement by comparison:__

__7) Method of measurement by substitution:__

__7) Method of measurement by substitution:__

__8) Method of measurement by transposition :__

__8) Method of measurement by transposition :__

__9) Method of differential measurement: __

__9) Method of differential measurement:__

__10) Method of measurement by complement:__

__10) Method of measurement by complement:__

**Reference: Book Of Engineering Metrology By R.k. Jain**

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