In chemistry, materials science, and physics, the solidus is a line on a phase diagram below which a given substance is stable in the solid phase. Most commonly, this line represents a transition temperature. The solidus may be a straight line, or it may be curved, depending upon the substance. The solidus is most often applied to binary systems such as solid solutions, including metal alloys. This article or section includes a list of works cited or a list of external links, but its sources remain unclear because it lacks in-text citations. ... The Materials Science Tetrahedron, which often also includes Characterization at the center Materials science is an interdisciplinary field involving the properties of matter and its applications to various areas of science and engineering. ... Physics (Greek: (phúsis), nature and (phusiké), knowledge of nature) is the science concerned with the fundamental laws of the universe. ... Solidus (Latin) is the name of a Roman coin during the Roman Empire. ... In physical chemistry and materials science, a phase diagram is a type of graph used to show the equilibrium conditions between the thermodynamically-distinct phases. ... For other uses, see Solid (disambiguation). ... Fig. ... Binary system may refer to one of the following. ... Fig. ... Hot metal work from a blacksmith In chemistry, a metal (Greek: Metallon) is an element that readily loses electrons to form positive ions (cations) and has metallic bonds between metal atoms. ... An alloy is a combination, either in solution or compound, of two or more elements, at least one of which is a metal, and where the resulting material has metallic properties. ...

The solidus may be contrasted to the liquidus. The solidus and liquidus do not necessarily align or overlap. If a gap exists between the solidus and liquidus, then within that gap, the substance is not stable as either a solid or a liquid; such is the case, for example, with the olivine (fosterite-fayalite) system. In chemistry, materials science, and physics, the liquidus is a line on a phase diagram above which a given substance is stable in the liquid phase. ... A liquid will usually assume the shape of its container A liquid is one of the main states of matter. ... The mineral olivine (also called chrysolite and, when gem-quality, peridot) is a magnesium iron silicate with the formula (Mg,Fe)2SiO4. ... Forsterite (Mg2SiO4) is the magnesium rich end-member of the olivine solid-solution series. ... Fayalite (Fe2SiO4) is the iron rich end-member of the olivine solid-solution series. ...

Note that water is very unusual in having a solidus temperature that decreases with increasing pressure. Most materials that do not contain water are more prone to solidifying (higher solidus temperature) under higher pressure. Impact of a drop of water Water is a chemical substance that is essential to all known forms of life. ...