College Physics II – Mechanics, Sound, Oscillations, and Waves
Definition
Volume stress is the type of stress applied uniformly in all directions on a body, resulting in a change in its volume. It is mathematically expressed as the ratio of force exerted to the surface area over which it acts.
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It causes a volumetric strain in materials, leading to changes in density and volume.
The bulk modulus is the material property that quantifies its resistance to volume stress.
Volume stress is measured in pascals (Pa) or newtons per square meter (N/m²).
Common examples include pressure exerted by fluids on container walls and atmospheric pressure on objects.
Review Questions
What type of strain does volume stress cause in a material?
How is volume stress mathematically defined?
Which material property quantifies resistance to volume stress?
Related terms
Bulk Modulus: A measure of a substance's resistance to uniform compression, defined as the ratio of volumetric stress to volumetric strain.
Volumetric Strain: The change in volume per unit original volume due to applied uniform pressure.
Elastic Modulus: \text{A general term for measures of how materials deform under various types of load. It includes Young's modulus, shear modulus, and bulk modulus.}