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Impact of Materials on Society

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atomic properties density, mass etc ex) compare magnesium tungsten with aerogel thermal properties melting point, thermal conductivity etc ex compare aerogel with a diamond mechanical properties strength, ductility, hardness, etc ex) compare ductility before and after quenching car ...

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  • September 21, 2022
  • 10
  • 2022/2023
  • Exam (elaborations)
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Impact of Materials on
Society
atomic properties Correct Answer: density, mass etc
ex) compare magnesium tungsten with aerogel

thermal properties Correct Answer: melting point, thermal conductivity etc
ex compare aerogel with a diamond

mechanical properties Correct Answer: strength, ductility, hardness, etc
ex) compare ductility before and after quenching car aluminum/steel/magnesium

optical properties Correct Answer: color reflectivity etc

magnetic properties Correct Answer: electricity

properties of Metals Correct Answer: High density, strong, ductile
High thermal and electrical conductivity.
Opaque, reflective
Can corrode

properties of Ceramics Correct Answer: Medium density
Brittle, glassy, inelastic
Non-conducting (insulators).
Corrosion resistant.

properties of Polymers Correct Answer: Long carbon chains
Soft, ductile
Low strength, low density,
Thermal and electrical insulators ,
corrosion resistant

Composites Correct Answer: Where your mixing two or more materials; particle
reinforced.
Ex: concrete.

Role of Clay Correct Answer: Ancient uses of clay

, -Buliding materials
-writing materials
-cooking materials
-storage materials
-sling ammuniton
-musical instuments
-medical (Ermenian bole/ early milk of magneisa)

Clay modern uses
-pottery
-builiding materials
-odor absorbants (cat litter)
-oil drilling wells
-gasoline production
-paper making
-cement production
-mold binders

Clay structure/definition Correct Answer: Clay composition
Usually Aluminum (Al), Silicon (Si), and Oxygen (O), and other elements
sometimes

Clay definition
Naturally occurring material composed of grained materials that show plasticity
(flexibility), when different water amounts are added. Clay can be harden when its
dried and/or fried (heated)

Clay properties
High strength in compression (after firing).
Poor strength in tension.
You wouldn't want to build a clay bridge. It would collapse

Clay history Correct Answer: -Paleolithic (2.5 M to 15,000 yrs ago)
*Central Europe
*Clay figurines
-Mesolithic (15,000-11,000)
*Japanese Pottery
-Neolithic (10,000 to 5000 years ago)
*Jerico/Israel clay bricks
*rise of the mesopotamian/sumarians

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