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Mechanical Properties Of Fluids

Question

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Amorphous substances do not have sharp melting point but get softening range before melting, while crystalline substances have sharp melting point. Explain.

Solution

Amorphous substances possess short-range arrangement of atoms or molecules. These short and ordered arrangement disappears gradually on heating. Before melting, this gradual change makes the amorphous substance soft.
While in crystalline substances, there is a long-range order arrangement of atoms or molecules. This arrangement disappears at a definite temperature and hence have sharp melting points.

Some More Questions From Mechanical Properties of Fluids Chapter

Which state of matter possesses rigidity?

What is elasticity?

Name the property of material that opposes the deformation in it.

Name the quantity which has neither unit nor dimensions.

Why strain is dimensionless?

What is stress?

Name the two types of stress.

What is tensile stress?

What is compression stress?

Define tangential stress.

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