Elongation at failure.

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Multiple Choice

Elongation at failure.

Explanation:
Elongation at failure is the total amount a material can stretch before it breaks, usually expressed as a percentage of its original length. This property is known as ultimate elongation, the standard term for elongation at break. It directly reflects ductility: a higher ultimate elongation means the material can deform plastically more before fracturing. The other terms—solvent, ultraviolet light, and substrate—don’t describe how much a material stretches under load, so they don’t fit the concept of elongation at failure.

Elongation at failure is the total amount a material can stretch before it breaks, usually expressed as a percentage of its original length. This property is known as ultimate elongation, the standard term for elongation at break. It directly reflects ductility: a higher ultimate elongation means the material can deform plastically more before fracturing. The other terms—solvent, ultraviolet light, and substrate—don’t describe how much a material stretches under load, so they don’t fit the concept of elongation at failure.

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