bulk modulus: meaning, definition, pronunciation and examples
Very Low FrequencyTechnical/Scientific
Quick answer
What does “bulk modulus” mean?
A measure of a substance's resistance to uniform compression. It quantifies how much pressure is needed to cause a given relative decrease in volume.
Audio
Pronunciation
Definition
Meaning and Definition
A measure of a substance's resistance to uniform compression. It quantifies how much pressure is needed to cause a given relative decrease in volume.
In physics and engineering, a key material constant (denoted K) in the theory of elasticity, defined as the ratio of the infinitesimal pressure increase to the resulting relative decrease in volume. It describes a material's incompressibility and is a critical parameter in fluid mechanics, solid mechanics, and geophysics.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Spelling of related terms may differ (e.g., 'behaviour' vs. 'behavior').
Connotations
Identical technical connotations.
Frequency
Equally rare and confined to identical technical fields in both varieties.
Grammar
How to Use “bulk modulus” in a Sentence
The bulk modulus of [MATERIAL] is [VALUE].[MATERIAL] has a high/low bulk modulus.The bulk modulus is defined as K = -V (dP/dV).Vocabulary
Collocations
Examples
Examples of “bulk modulus” in a Sentence
verb
British English
- The material's response is characterised by its bulk modulus.
- We need to bulk-modulus test the new alloy. (rare, non-standard)
American English
- The material's response is characterized by its bulk modulus.
- Engineers bulk-modulus-tested the composite. (rare, non-standard)
adverb
British English
- The material reacted bulk-modulus-dependently. (highly contrived, technical)
American English
- The material reacted in a bulk-modulus-dependent manner. (contrived)
adjective
British English
- The bulk-modulus value is critical for the design.
- This is a high-bulk-modulus material.
American English
- The bulk-modulus value is critical for the design.
- This is a high-bulk-modulus material.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Used in physics, materials science, mechanical engineering, civil engineering, geophysics, and chemistry departments.
Everyday
Never used in everyday conversation.
Technical
Core term in technical specifications, material data sheets, and engineering design calculations involving fluids and solids under pressure.
Vocabulary
Synonyms of “bulk modulus”
Strong
Neutral
Weak
Vocabulary
Antonyms of “bulk modulus”
Watch out
Common Mistakes When Using “bulk modulus”
- Confusing it with 'Young's modulus' (which measures linear stretch) or 'shear modulus'.
- Pronouncing 'modulus' as 'module-us'.
- Using it as a countable noun in plural form incorrectly (e.g., 'bulk moduluses'; the plural is 'bulk moduli' /ˈmɒdʒʊlaɪ/).
FAQ
Frequently Asked Questions
Young's modulus measures resistance to linear stretching or compression along one axis, while bulk modulus measures resistance to uniform compression from all sides (volume change).
In standard stable materials, no. A negative bulk modulus would mean the material expands when compressed, which is physically unstable under ordinary conditions, though it can be engineered in some metamaterials.
Pascals (Pa), gigapascals (GPa), or sometimes pounds per square inch (psi) in some engineering contexts. It has the same units as pressure.
Hydraulic systems rely on the incompressibility of fluids to transmit force. The bulk modulus determines how much the fluid will compress under pressure, affecting system stiffness, response time, and efficiency.
A measure of a substance's resistance to uniform compression. It quantifies how much pressure is needed to cause a given relative decrease in volume.
Bulk modulus is usually technical/scientific in register.
Bulk modulus: in British English it is pronounced /ˌbʌlk ˈmɒdʒələs/, and in American English it is pronounced /ˌbʌlk ˈmɑːdʒələs/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None. It is a strictly technical term.”
Learning
Memory Aids
Mnemonic
Think of a BULK of material being squeezed. The BULK modulus tells you how much it resists being squashed into a smaller BULK.
Conceptual Metaphor
MATERIAL AS SPRING: A high bulk modulus is like a very stiff spring when you try to compress it.
Practice
Quiz
What does a high bulk modulus indicate about a material?