Lecture 3 physical properties of materials

This lecture contains information about types of materials and what characteristics must be considered during selection of materials for particular application. Later, it classify physical and chemical properties and its relationship with structures.

1. Physical Properties
of Materials and
structure
Engr. Mukesh Kumar
DepartmentofMetallurgyandMaterialsEngineering,Mehran,UETJamshoro.

2. 02
03
01
Outline of today’s Lecture
Engr. Mukesh Kumar 2
Background
Information
Definition of Physical
and Chemical
Properties
Examples of Intensive
& Extensive Properties
Extended
Learning05
04
Conclusion

3. Materials Properties
3
Inthistechnologicalepoch,wearedealingwithvariety
ofmaterialswithdifferentpropertiesandapplications.
Classificationofmaterialsisbasedontheirproperties
orapplications.
Forexample:CastIron,ToolSteel,SpringSteel,
semiconductingmaterials,biomedicalmaterials,
HDPE,LDPE,etc.
Engr. Mukesh Kumar

4. 4
Engr. Mukesh Kumar

5. 5
Materials Selection
Engr. Mukesh Kumar

6. 6
Properties
of
Materials
Chemical
Properties
Physical
Properties
Engr. Mukesh Kumar

7. 7Engr. Mukesh Kumar
Physical property: Any characteristic that can be determined
without changing the substance’s chemical identity.
Chemical property: Any characteristic that can be determined
only by changing a substance’s molecular structure.
Physical and Chemical Properties

8. 8
Enlist at least 3
Examples of Chemical
and Physical Properties
Engr. Mukesh Kumar

9. 9Engr. Mukesh Kumar
Intensive Properties: Any characteristic of matter that does
not depend on the amount of the substance present.
Extensive property: Any characteristic of matter that depends
on the amount of matter being measured.
All physical properties are either Intensive or Extensive

10. 10
Enlist at least 3
Examples of Intensive
and Extensive
Properties
Engr. Mukesh Kumar

11. Your Date Here Your Footer Here 11

12. Your Date Here Your Footer Here 12

13. 13
Conclusion
Engr. Mukesh Kumar

14. 14
Material Engineering student would like to answer for
Why is glass brittle, while copper is ductile? What is meant by a ductile material?
If we take two rods, one of Al and one of steel, why is it easier to bend the Al rod as compared
to the steel rod?
How can I change properties like hardness, without changing the composition (say of 0.8% C steel)?
Why is glass transparent, while any typical metal is opaque?
Why does the electrical conductivity of Cu decrease on heating, while that of Si increases?
Why does Iron corrode easily, while Aluminum does not (or does not seem to?!)?
How come I can hold a molten material in the liquid state below the melting point (e.g. water
can be held at sub-zero (C) temperatures), for at least some time (in many cases this is not difficult)?
Usually, good thermal conductors are also good electrical conductors. Why is this so?
Why is diamond a good thermal conductor, but not a good electrical conductor?
If I pull a spring and then release the load, it ‘comes back’ to its original shape. However, a if I
bend an aluminum rod, does not come back to its original shape. How can one understand these
observations?

15. You are
welcome to ask
any question…
15Engr. Mukesh Kumar
Extended
Learning

16. Have a Good Day!
16Engr. Mukesh Kumar