The document defines measurement in several ways including as the act of assigning numbers to represent attributes, as well as scientifically as rules for assigning symbols to represent quantities numerically or classify objects. It discusses physical quantities that can be measured like length and time, as well as non-physical quantities. Measurement consists of a magnitude and a unit, and there are two types of physical quantities: scalar and vector. The International System of Units (SI) defines seven base units and derived units are obtained by combinations of the base units using algebraic relationships. Measurement is important and plays a vital role in many aspects of modern life from transportation to healthcare to commerce.

3. Definition of Measurement
Dictionary = It is defined as the act of measuring or the size
of something.
For examples = measurement means the use of a ruler to
determine the length of a piece of paper.
Scientific = It is defined as rules for assigning numbers to
objects in such a way as to represent quantities of attributes.
It consists of rules for assigning symbols to objects so as to 1)
represent quantities of attributes numerically (scaling) or 2)
define whether the objects fall in the same or different
categories with respect to a given attribute (classification)

4. The quantities which can be measured are known
as physical quantities.
For example = length , time and e.t.c
Non physical quantities are love , hate and e.t.c
It consists of at least a magnitude and a unit
For example = 5m
There are 2 type of physical quantity
1)Scalar
2) Vector

5. The International System of Units, defines seven units of measure as a basic set from
which all other SI units are derived.
We define unit as 1.0 . For example 5m means 5 * 1.0 m i.e 5m length is 5 times the
length of 1.0 m .
SI stands for “system of international” units.
It is written as SI not S.I units.
SI units
Base or
Fundamental
units
Supplementary
Units
Derived Units

7.  catch a train
 buy petrol
 have an x-ray
 eat safe foods
 travel by aeroplane
 use your mobile
Measurement is everywhere, playing a vital
role in our lives. Metrology is the science
of measurement and National Metrology
Institutes around the world make sure that
the measurements we use are fit for
purpose. In the UK, the measurement
infrastructure is provided by the National
Measurement System (NMS).

8. Why measurement is important ?
Measurement underpins the welfare of a modern society and touches
almost every part of daily life:
• Ensuring the safety and effectiveness of healthcare diagnostics
and treatments
• Measuring the composition, energy value and quantity of gas
piped to our homes, or of fuel in our vehicles
• Ensuringsafe operation of aircraft in flight
• Ensuringconsistency of international time standards so we can
communicate reliably and navigate accurately throughout the
world
• Quantifying emissions of greenhouse gases to understand and
mitigateclimate change
• Ensuring the security and sustainability of our food supply
• Ensuringfairness between buyers and sellers in markets
where goods are sold by weight or volume

9. Measurement plays a fundamental part in the innovation
process. To develop new products and processes,
companies need to measure quantity, quality and
performance. To trade successfully, companies utilise a
regulatory framework, based upon measurement
confidence, ensuring access to global markets that are
fair and open and without unnecessary barriers to trade.
Supporting this is an established infrastructure of
traceable measurement linked seamlessly to the national
standards maintained . In some industries the need for
accurate measurement is critical. For example,
companies manufacturing precision engineering
components used in aero engines will be working to tight
specifications and must be able to measure size, material
composition and performance to very accurate levels.
For many of us a visit to a hospital may not be desirable,
but knowing that the treatment has been appropriately
measured throughout its development, trials and final

10. Measurement plays a fundamental part in the
innovation process. To develop new and
improved products and processes, companies
are looking for:
• improvements in quality or
performance
• reductionsin waste
• use of new materials or techniques
All of these require appropriate measurement
support. For many organisations, their first
interaction with measurement is through the
route of compliance with a standard. NMS
expertise forms an input to over 800 standards
Measurement helps innovation

11. SI Base Units