Stress (mechanics)
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In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such as a stretched elastic band, is subject to tensi
Residual stresses inside a plastic protractor are revealed by polarized light.
Roman-era bridge in Switzerland. The stone arches in the bridge are subject to compressive stresses.
Inca bridge on the Apurimac River. The rope in the bridge is subject to tensile stresses.
Glass vase with the craquelé effect. The cracks are the result of brief but intense stress created when the semi-molten piece is briefly dipped in water.
Viscosity
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In continuum mechanics, viscosity is a property of a fluid that quantifies the resistance force acting on fluids when there is relative motion between fluid parcels. This resistance force is caused by
Common logarithm of viscosity against temperature for B2O3, showing two regimes
In the University of Queensland pitch drop experiment, pitch has been dripping slowly through a funnel since 1927, at a rate of one drop roughly every decade. In this way the viscosity of pitch has been determined to be approximately 230 billion (2.3×1011) times that of water.
Honey being drizzled