Meaning & use
the modulus of elasticity
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Meanings
nounsingulartechnicalphysics
A measure of how stiff a material is: the ratio of the force per unit area to the resulting small stretch.
Grammar: Used as a singular noun, almost always with "the"; it is not countable, so you do not say "a modulus of elasticity" for different values of the same material.
Patterns
- the modulus of elasticity of something
- a high/low modulus of elasticity
- measure the modulus of elasticity
The modulus of elasticity of steel is much higher than that of rubber.
Engineers test the modulus of elasticity to predict how far a bridge will bend under load.
A material with a low modulus of elasticity stretches easily and returns to its original shape.
nounsingulartechnicalspecialist
In everyday engineering use, the stiffness value obtained from the straight part of a stress-strain graph.
Grammar: Often shortened to "modulus" once the context is clear; the full phrase is used when first introducing the idea.
Patterns
- find/calculate the modulus of elasticity
- the modulus of elasticity is given by something
- plot something to obtain the modulus of elasticity
The lab report asks you to calculate the modulus of elasticity from the slope of the line.
On the graph, the gradient in the straight section gives the modulus of elasticity.
Common combinations
- a high modulus of elasticity
- Ceramics generally have a high modulus of elasticity, so they barely flex.
- a low modulus of elasticity
- Foam has a low modulus of elasticity and cushions impacts well.
- measure the modulus of elasticity
- The team measured the modulus of elasticity of each sample three times.
- the modulus of elasticity of a material
- The modulus of elasticity of a material does not depend on the size of the piece.
- calculate the modulus of elasticity
- You can calculate the modulus of elasticity by dividing stress by strain in the elastic range.
Synonyms and how they differ
- elastic modulus
- A broader term that covers several related quantities; use it when you do not want to name one specific type.
- Young's modulus
- The usual name for this quantity when the material is pulled or pushed in one direction; it is the most common type of modulus of elasticity.
- stiffness
- An everyday word for how hard something is to bend, but it also depends on shape and size, while the modulus of elasticity depends only on the material.
Word family
- elastic adjective
- Able to stretch or bend and then return to the original shape.
- elasticity noun
- The property of being able to stretch and spring back.
- modulus noun
- A number that measures a particular property of a material, such as stiffness or resistance to shear.
Commonly confused: the modulus of elasticity or elastic limit? the modulus of elasticity or modulus?
the modulus of elasticity vs elastic limit
The elastic limit is the greatest stress a material can take and still spring back; the modulus of elasticity describes stiffness, not how far it can stretch before permanent damage.
the modulus of elasticity vs modulus
On its own, "modulus" can mean other things, including the remainder operation in math; the full phrase makes the physics meaning clear.
Practice
Which sentence uses "the modulus of elasticity" correctly?
Choose one answer.
Option 0 uses the phrase as a singular quantity and compares two materials correctly. Option 1 wrongly treats it as countable with a plural verb; option 2 confuses stiffness with weight; option 3 uses a plural verb with a singular subject and wrongly suggests the value depends on the beam's length.
Make it your own
Write a sentence using “the modulus of elasticity”, then check it and compare it with the examples above.