Fluid solutionIn general relativity, a fluid solution is an exact solution of the Einstein field equation in which the gravitational field is produced entirely by the mass, momentum, and stress density of a fluid. In astrophysics, fluid solutions are often employed as stellar models. (It might help to think of a perfect gas as a special case of a perfect fluid.) In cosmology, fluid solutions are often used as cosmological models.
Stress–strain analysisStress–strain analysis (or stress analysis) is an engineering discipline that uses many methods to determine the stresses and strains in materials and structures subjected to forces. In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material. In simple terms we can define stress as the force of resistance per unit area, offered by a body against deformation.
Flacon de laboratoirethumb|Flacons divers en verre. Les flacons de laboratoire font partie de la verrerie de laboratoire de base. Les types les plus courants sont : flacon laveur ; fioles (erlenmeyer, ...) ; flacon isolant : vase de Dewar ; ballons, à col rodé ou non ; flacon de compte-gouttes. Les usages sont variés : préparation de solutions, volumétrie, analyse, conservation, collecte, réactions chimiques, procédés tels mélange, solvatation, précipitation, ébullition (comme en distillation) Ils sont traditionnellement en verre, lequel peut être renforcé, ou en plastique.
