Explain stress and strain curve; Different Modulus eg young,bulk etc; elasticity?; What is strain it's unit?;What is hardness ,toughness,etc

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Questions related to stress-strain curve, modulus, elasticity, strain, hardness, and toughness.

Stress-strain curve shows the relationship between stress and strain in a material.
Young's modulus measures the stiffness of a material under tension or compression.
Bulk modulus measures the resistance of a material to uniform compression.
Elasticity is the ability of a material to return to its original shape after deformation.
Strain is the measure of deformation in a material and its unit is dimensionless.
Hardness is the resistance of a material to indentation or scratching.
Toughness is the ability of a material to absorb energy before fracturing.

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