REVIEW QUESTIONS .7. What are the important variables that affect mass 1 Define
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REVIEW QUESTIONS .7. What are the important variables that affect mass 1 Define density as a material property 2 What is the difference in melting characteristics diffusion? between a pure metal element and an alloy metal?4.8. Define resistivity as a material property 3. Describe the melting characteristics of a non4.9. Why are metals better conductors of electricity than crystalline material such as glass ceramics and polymers? 4.4. Define specific heat as a material property. 45. What isthermal conductivity as a material property?411 .6. Define thermal diffusivity .10. What is dielectric strength as a material property? What is an clectrolyte?Explanation / Answer
4.1 Density as material property is an quantitative expression of mass contained per unit volume. SI UNIT IS kg/m3.
4.2 Alloy is blend of two or more metals. There thermal and electrical properties are lower as compared to pure metal. Alloy have lower melting point as compared to pure metal.
4.3 Glass is also known as super fliud. Glass is not a crystal which have definite melting point. It's atoms are not arranged in orderly manner. Glass have only glass transition point at which it's atoms gain enough thermal energy and starts to flow. Soda lime glass, used in Windows have glass transition around 400°C . In old houses we can see thick window at the bottom.
4.4 specific of material is amount of heat per unit mass required to raise the temperature of material by one degree Celsius.
4.5 thermal conductivity is the degree up to which a material conduct heat. It is property of material to conduct heat. Reciprocal of thermal conductivity is thermal resistivity.
4.6 It is thermal conductivity of a material divided by density and specific heat capacity of material.
4.7 mass diffusion gets effected when : distance of diffussdi decrease, concentrate gradient increases and surface area of diffusion increases.
4.8 resistivity is measure of resistance power offered by material to electrical conductivity.
4.9 metals are better conductor as compared to ceramics and polymer because in metals we have conductivity due to free flowing electrons. Electrons are immersed in metal ions. While in case of ceramics and polymer this is not present.
4.10 dielectric strength is measure of property of material in which we measure maximum voltage which can be applied to material without causing it to break down.
4.11 it is any liquid or gel which contains ions and can be decomposed using electrolysis.
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