The elasticity of the product can be known when the force is applied to the body. The amount of deformation that the body undergoes when force is applied on the body to the time it takes to get back to the original shape when force is removed is known as elasticity. Young’s modulus is a concept in physics that describes the tensile elasticity of a material.

Let us know what is Young’s modulus?

Young’s Modulus is also known as Tensile Modulus or Elastic Modulus. Young’s Modulus is a measure of mechanical properties of linear elastic solids like wires, rods, and many more. Young’s Modulus was the contribution of British scientist Thomas Young.

Young’s modulus is a measure of the strength of a material to resist changes in length when lengthwise tension or compression is applied and is also known as modulus of elasticity.

In linear elasticity, A solid material experiences elastic deformation when a small load is applied to it. It leads to compression or extension in the solid material. Elastic deformation is reversible and hence the material can return to its original shape after the load is removed. Below graph explains the stress-strain relationship. It explains that stress is directly proportional to the strain.

According to the graph,

Where,

E = Young’s modulus

= uniaxial stress or force applied

= stain or resultant deformation

Units of the Young modulus E= Nm-2 or Pa

The rigidity of the body can be known through Young’s Modulus since the body resists the changes on the application of force.


The Young’s Modulus values for different material are given below:

  • Wood – 13
  • Steel – 200
  • Plastic (Polystyrene) – 3
  • Glass – 65

Young’s modulus allows us to calculate the change in the dimension of a bar made of an isotropic elastic material under compressive load (force). For instance, Young’s modulus forecasts how much a material can extend under tension or shortens under compression.

Now let us know the classification of conductor and insulator.

A material is classified as conductors or insulator depending on the ability to conduct electricity.

Conductors are the materials which are capable of passing electricity through it.  Electrons present in various conducting material have a different level of freedom to move randomly inside the material. Since the electrons present in the atoms are loosely held, electrons move randomly inside the material gaining the capacity to conduct.

Example: Iron, mercury, brass, Lemon water, Bronze, graphite, silver and many more.

Know that plain water or tap water is an excellent source of conductivity. Pure water or distilled water does not exhibit conductivity. When salt is added to the water it increases its conductivity.

Insulators are the type of material which is characterized by low electron mobility or by the absence of free electrons. Insulators resist the flow of electrons from one atom to another. Insulators are materials whose electrons in atoms are tightly bound and hence electrons cannot move to conduct electricity.

Example: Quartz, Asphalt, Air, Fiberglass, Rubber, Diamond, Glass, Porcelain and many more.

For more information on conductors and insulators, stay tuned with BYJU’S!

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