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What is a phase in chemistry?
What is a phase of matter?
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What does phase mean on a phase diagram?
How are phases different from states of matter?
Jan 30, 2023 · A phase is a distinct and homogeneous state of a system with no visible boundary separating it into parts. Water, \(\ce{H2O}\), is such a common substance that its gas (steam), liquid (water), and solid (ice) phases are widely known.
- Phase Transition - a Review
This quiz covers aspects related to phase transitions or...
- Phase Diagrams
Phase diagram is a graphical representation of the physical...
- Phase Transition - a Review
- Overview
- General considerations
- System variables
- The phase rule
phase, in thermodynamics, chemically and physically uniform or homogeneous quantity of matter that can be separated mechanically from a nonhomogeneous mixture and that may consist of a single substance or a mixture of substances. The three fundamental phases of matter are solid, liquid, and gas (vapour), but others are considered to exist, includin...
A system is a portion of the universe that has been chosen for studying the changes that take place within it in response to varying conditions. A system may be complex, such as a planet, or relatively simple, as the liquid within a glass. Those portions of a system that are physically distinct and mechanically separable from other portions of the system are called phases.
Phases within a system exist in a gaseous, liquid, or solid state. Solids are characterized by strong atomic bonding and high viscosity, resulting in a rigid shape. Most solids are crystalline, inasmuch as they have a three-dimensional periodic atomic arrangement; some solids (such as glass) lack this periodic arrangement and are noncrystalline, or amorphous. Gases consist of weakly bonded atoms with no long-range periodicity; gases expand to fill any available space. Liquids have properties intermediate between those of solids and gases. The molecules of a liquid are condensed like those of a solid. Liquids have a definite volume, but their low viscosity enables them to change shape as a function of time. The matter within a system may consist of more than one solid or liquid phase, but a system can contain only a single gas phase, which must be of homogeneous composition because the molecules of gases mix completely in all proportions.
Systems respond to changes in pressure, temperature, and chemical composition, and, as this happens, phases may be created, eliminated, or altered in composition. For example, an increase in pressure may cause a low-density liquid to convert to a denser solid, while an increase in temperature may cause a solid to melt. A change of composition might result in the compositional modification of a preexisting phase or in the gain or loss of a phase.
Britannica Quiz
The classification and limitations of phase changes are described by the phase rule, as proposed by the American chemist J. Willard Gibbs in 1876 and based on a rigorous thermodynamic relationship. The phase rule is commonly given in the form P + F = C + 2. The term P refers to the number of phases that are present within the system, and C is the m...
Sep 12, 2019 · In chemistry and physics, a phase is a physically distinctive form of matter, such as a solid, liquid, gas, or plasma. A phase of matter is characterized by having relatively uniform chemical and physical properties. Phases are different from states of matter.
- Anne Marie Helmenstine, Ph.D.
Jul 3, 2019 · A phase of matter is uniform with respect to its physical and chemical properties. Matter undergoes phase transitions to change from one phase to another. The primary phases of matter are solids, liquids, gases, and plasma.
- Anne Marie Helmenstine, Ph.D.
A phase diagram represents the various physical states or phases of matter at different pressures and temperatures. In other words, it summarizes the effect of pressure and temperature on the nature of a substance.
In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water.
Jan 30, 2023 · Phase diagram is a graphical representation of the physical states of a substance under different conditions of temperature and pressure. A typical phase diagram has pressure on the y-axis and …
