write and explain any four properties of materials.
Answers
Explanation:
The four properties of material are mass, toughness, hardness and malleability. EXPLANATION: Materials occurs in nature according to their compactness. Material are categorized into three common states in which they are present, they are solid liquid and gas.
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Density
This is the mass per unit volume, of a material. Clearly the density of a material is important to a designer wherever the weight of a product is a major consideration e.g. anything which is portable, packaging, aircraft racing cars etc. Density is important in relation to product weight and size.
Electrical resistivity
This is a measure of a material s ability to conduct electricity. A material with a low resistivity will conduct electricity well.
Thermal conductivity
A measure of how fast heat is conducted through a slab of material with a given temperature difference across the slab.
Thermal expansion
This is a measure of the degree of increase in dimensions when an object is heated. This can be measured by an increase in length, or area or volume. The expansivity can be measured as the fractional increase in dimension per Kelvin increase in temperature.
Hardness
The resistance a material offers to penetration or scratching.
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