give two example of materials that possess the following properties
1.porosity:_______,______
2.Mslleability:_____,______
3.Hardness:______,______
4.Brittleness:______,_____
5.Brittleness:______,_____
1.porosity:_______,______
2.Mslleability:_____,______
3.Hardness:______,______
4.Brittleness:______,_____
5.Brittleness:______,_____
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Answer:
1. Sponges, wood, rubber, and some rocks are porous materials. In contrast, marble, glass, and some plastics are not porous and contain very few open pockets of air (or pores). A rock with good porosity is an important characteristic for an oil well.
2. Examples of malleable metals are gold, iron, aluminium, copper, silver and lead.
3. Brittle materials include most ceramics and glasses (which do not deform plastically) and some polymers, such as PMMA and polystyrene. Many steels become brittle at low temperatures (see ductile-brittle transition temperature), depending on their composition and processing.