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| the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature |
| the direct effect that one kind of particle has on another in inducing the emission or absorption of one particle by another |
| modulus of elasticity | |
| —n | |
| Young's modulus bulk modulus See also modulus of rigidity Also called: elastic modulus the ratio of the stress applied to a body or substance to the resulting strain within the elastic limit | |
| modulus of elasticity
The ratio of the stress applied to a body to the strain that results in the body in response to it. The modulus of elasticity of a material is a measure of its stiffness and for most materials remains constant over a range of stress. ◇ The ratio of the longitudinal strain to the longitudinal stress is called Young's modulus. ◇ The ratio of the stress on the body to the body's fractional decrease in volume is the bulk modulus. ◇ The ratio of the tangential force per unit area to the angular deformation in radians is the shear modulus. See also Hooke's law. |