Engineering Materials
The molecules in a solid move

In a haphazard way
Back and forth like tiny pendulums
In circular motion
In a random manner

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Engineering Materials
Thermoplastic materials are those materials which

Do not become hard with the application of heat and pressure and no chemical change occurs
Are formed into shape under heat and pressure and results in a permanently hard product
Are used as a friction lining for clutches and brakes
Are flexible and can withstand considerable wear under suitable conditions

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Engineering Materials
Chromium in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves cutting ability and reduces hardenability
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves wear resistance, cutting ability and toughness

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