Rigid or rigidity may refer to:
- In mathematics and physics:
- Stiffness, the property of a solid body to resist deformation, which is sometimes referred to as rigidity
- Structural rigidity, a mathematical theory of the stiffness of ensembles of rigid objects connected by hinges
- Rigidity (electromagnetism), the resistance of a charged particle to deflection by a magnetic field
- Rigidity (mathematics), a property of a collection of mathematical objects (for instance sets or functions)
- Rigid body, in physics, a simplification of the concept of an object to allow for modelling.
- In medicine:
- Rigidity (neurology), an increase in muscle tone leading to a resistance to passive movement throughout the range of motion
- Rigidity (psychology), an obstacle to problem solving which arises from over-dependence on prior experiences
- In economics:
- Real rigidity and nominal rigidity, the resistance of prices and wages to marketchanges in macroeconomics.
- Ridgid, a brand of tools
Famous quotes containing the word rigidity:
“[University students] hated the hypocrisy of adult society, the rigidity of its political institutions, the impersonality of its bureaucracies. They sought to create a society that places human values before materialistic ones, that has a little less head and a little more heart, that is dominated by self-interest and loves its neighbor more. And they were persuaded that group protest of a militant nature would advance those goals.”
—Muriel Beadle (b. 1915)