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| light waves or particles, the band of colors produced when sunlight passes through a prism, comprising red, orange, yellow, green, blue, indigo, and violet |
| the force that acts between bodies of like electric charge or magnetic polarity, tending to separate them |
| 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. |