Even though the concept of phases is widely-used in the physical sciences, it is not easy to define precisely. Before presenting the general definition, we will provide two common examples of phase phenomena: firstly, the ordinary solid, liquid, and gas phases of matter; secondly, the paramagnetic and ferromagnetic phases of magnetic materials. Phase matter - Example 1: Solid liquid and gas phases. Water (H2O) is composed of water molecules, each of which is an oxygen atom attached to two hydrog ...

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Phase matter, Phase matter - Definition, Phase matter - Example 1: Solid liquid and gas phases, Phase matter - Example 2: Magnetic phases, Phase matter - General definition of phases, Phase matter - Other examples of phases, Phase matter - Phase diagrams, Phase matter - Metastable phases, Phase matter - Phase equilibrium, Phase matter - Emergence and universality

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Phase matter, Phase matter - Definition, Phase matter - Example 1: Solid liquid and gas phases, Phase matter - Example 2: Magnetic phases, Phase matter - General definition of phases, Phase matter - Other examples of phases, Phase matter - Phase diagrams, Phase matter - Metastable phases, Phase matter - Phase equilibrium, Phase matter - Emergence and universality

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Main article: Phase diagram The different phases of a system may be represented using a phase diagram. The axes of the diagrams are the relevant thermodynamic variables. For simple mechanical systems, we generally use the pressure and temperature. The following figure shows a phase diagram for a typical material exhibiting solid, liquid and gaseous phases. The markings on the phase diagram show the points where the free energy is non-analytic. The open spaces, where the free energy is analytic, correspond to the phases. The phases are separated by lines of non-analyticity, where phase transitions o ...

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Phase matter, Phase matter - Definition, Phase matter - Example 1: Solid liquid and gas phases, Phase matter - Example 2: Magnetic phases, Phase matter - General definition of phases, Phase matter - Other examples of phases, Phase matter - Phase diagrams, Phase matter - Metastable phases, Phase matter - Phase equilibrium, Phase matter - Emergence and universality

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A gas is one of the four main phases of matter (after solid and liquid, and followed by plasma), that subsequently appear as a solid material is subjected to increasingly higher temperatures. Thus, as energy in the form of heat is added, a solid (e.g. ice) will first melt to become a liquid (e.g. water), which will then boil or evaporate to become a gas (e.g. water vapor). In some circumstances, a solid (e.g. "dry ice") can directly turn into a gas: this is called sublimation. If the gas is further heated, its atoms or molecules can become (wholly or partiall ...

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Gas - Etymology

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In physics, atomic theory is a theory of the nature of matter. It states that all matter is composed of atoms. The philosophical background of the atomic theory is called atomism. The theory applies to the common phases of matter, namely solids, liquids and gasses, as directly experienced on Earth. Strictly speaking, it is not the approriate theory for plasmas or neutron stars where unusual environments such as extremes of temperature or density prevent atoms from forming. Atomic theory - Importance. Arguab ...

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Atomic theory - Importance Atomic theory - History
Atomic theory - Related lists

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Ice is frozen water (one of its three phases of matter), and thereby a transparent, crystal, soft and fragile solid. The phase transition occurs when liquid water is cooled below 0 °C (273.15 K, 32 °F) at standard atmospheric pressure. It appears in the most varied forms, from hail, to ice cubes, to enormous glaciers. Moreover it plays an important role with a great many meteorological phenomena. The ice caps of the polar regions are of great significance for the global climate and particularly the water cycle. Ice has notable physical properties, som ...

Including:

Ice - Types of ice Ice - Human relationship with ice
Ice - Sports on ice Ice - Ice travel Ice - Other uses of ice
Ice - Ice at different pressures
Ice - Phases of ice
Ice - Related terms

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A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. Fluids share the properties of not resisting deformation and the ability to flow (also described as their ability to take on the shape of their containers). These properties are typically a function of their inability to support a shear stress in static equilibrium. While in a solid, stress is a function of strain, in a fluid stress is a function of rate of strain. A consequence of this behaviour is Pascal's law which entails the important role of ...

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Matter is commonly referred to as the substance of which physical objects are composed. It constitutes the observable Universe. According to the theory of relativity there is no distinction between matter and energy, because matter can be converted to energy (see annihilation), and vice versa (see matter creation). Philosophically, matter constitutes the formless substratum of all things, which exists only potentially and from which reality is produced. In the sense of cont ...

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Matter - Matter in Science

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Sometimes a substance or mixture can be heated, compressed, etc., beyond the point at which it would normally exhibit a phase change, but without actually triggering the change. Examples include supercooling, superheating, and supersaturation. Such metastable states may sometimes be considered as phases, although strictly speaking they are not because they are unstable. For example, each polymorph of a given substance is usually only stable over a specific range of conditions. For example, diamond is only stable at extremely high pres ...

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Phase matter, Phase matter - Definition, Phase matter - Example 1: Solid liquid and gas phases, Phase matter - Example 2: Magnetic phases, Phase matter - General definition of phases, Phase matter - Other examples of phases, Phase matter - Phase diagrams, Phase matter - Metastable phases, Phase matter - Phase equilibrium, Phase matter - Emergence and universality

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Phase may refer to: Phase (matter), a physically distinctive form of a substance, such as the solid, liquid, and gaseous states of ordinary matter Phase (waves), the time position within a cycle of a periodic waveform Phase shifting or phasing, relative phase shift in superposing electromagnetic or acoustic waves; employed as an audio effect by musicians and DJs Phasing, a compositional technique in music Polyphase system, a means of distributing alternating current electrical power in

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Condensed matter physics is the field of physics that deals with the macroscopic physical properties of matter. In particular, it is concerned with the "condensed" phases that appear whenever the number of constituents in a system is extremely large and the interactions between the constituents are strong. The most familiar examples of condensed phases are solids and liquids, which arise from the electric force between atoms. More exotic condensed phases include the superfluid and the Bose-Einstein condensate found in certain atomic s ...

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Condensed matter physics - Topics in condensed matter physics

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A cooling curve is a line graph that represents the change of phase of matter, typically from either a gas to a solid or a liquid to a solid. Time is used in the x-axis while temperature is used for the y-axis. They are often used in chemistry and physics, and can apply (misleadingly) to matter behaviour during heating, as well as during cooling. Cooling curve graphs are useful as they clearly show up a phenomenon of phase changes of matter. To explain this, we shall use water as our example. First we start with a sealed ...

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Waste is unwanted or undesired material. Waste can exist in any phase of matter (solid, liquid, or gas). When released in the latter two states, gas especially, the wastes are referred to as emissions. It is usually strongly linked with pollution. Waste - Sources of waste. Waste produced in the wild is reintegrated through natural recycling processes, such as dry leaves in a forest decomposing into soil. Outside of the wild these wastes may become problematic, such as dry leaves in an urban environme ...

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Waste - Sources of waste Waste - Human waste

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Phases are emergent phenomena produced by the self-organization of a macroscopic number of particles. Typical samples of matter, for example, contain around 1023 particles (of the order of Avogadro's number). In systems that are too small -- even, say, a thousand atoms -- the distinction between phases disappears, since the appearance of non-analyticity in the free energy requires a huge, formally infinite, number of particles to be present. One might ask why real systems exhibit phases, since they are not actually infinite ...

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Phase matter, Phase matter - Definition, Phase matter - Example 1: Solid liquid and gas phases, Phase matter - Example 2: Magnetic phases, Phase matter - General definition of phases, Phase matter - Other examples of phases, Phase matter - Phase diagrams, Phase matter - Metastable phases, Phase matter - Phase equilibrium, Phase matter - Emergence and universality

Read more here: » Phase matter: Encyclopedia II - Phase matter - Emergence and universality

A Bose-Einstein condensate is a phase of matter formed by bosons cooled to temperatures very near to absolute zero. The first such condensate was produced by Eric Cornell and Carl Wieman in 1995 at the University of Colorado at Boulder, using a gas of rubidium atoms cooled to 170 nanokelvins (nK). Under such conditions, a large fraction of the atoms collapse into the lowest quantum state. Bose-Einstein condensate - Introduction. Bose-Einstein condensates are best known to laymen as extremely low temperature ...

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Bose-Einstein condensate - Introduction Bose-Einstein condensate - Theory Bose-Einstein condensate - Discovery Bose-Einstein condensate - Unusual characteristics Bose-Einstein condensate - Current research

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Heat (also improperly called heat change) is a transient form of energy. It quantifies the spontaneous transfer of thermal energy due to a temperature gradient. The SI unit for heat is the joule. Heat is a process quantity --as opposed to being a state quantity--, and is to thermal energy as work is to mechanical energy. Heat flows between regions that are not in thermal equilibrium with each other; it spontaneously flows from areas of high temperature to areas of low temperature. All objects (matter) have a certain amou ...

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Heat - Notation Heat - Changes of temperature Heat - Changes of phase Heat - Heat transfer mechanisms
Heat - Conduction Heat - Convection Heat - Radiation
Heat - Heat transfer features Heat - Heat dissipation

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Exact theoretical studies of quark matter need to use lattice QCD. However, in various parts of the phase diagram, its use is hampered by the fermion doubling problem and the fermion sign problem. Since the study of quark matter is so complicated, theorists like to change the quark mass to create simpler models of quark matter which (they hope) still capture crucial aspects of the physics. ...

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QCD matter, QCD matter - Thermodynamics, QCD matter - Order parameters, QCD matter - The phase diagram, QCD matter - The equation of state, QCD matter - Useful theoretical fictions, QCD matter - The quenched approximation, QCD matter - The chiral limit, QCD matter - The AdS/CFT limit, QCD matter - Weak coupling theory

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QCD contains many flavours of quarks and no flavour changing interactions. Therefore quark flavours are conserved charges. As a result, one can use a chemical potential with respect to each flavour charge. At temperatures below and in the vicinity of the QCD scale, one needs only the chemical potentials for the up (u), down (d) and strange (s) flavours, because the remaining quark flavours are too heavy to participate in the dynamics. The physics implications are sometimes clearer if one instead uses chemical potentials for ba ...

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QCD matter, QCD matter - Thermodynamics, QCD matter - Order parameters, QCD matter - The phase diagram, QCD matter - The equation of state, QCD matter - Useful theoretical fictions, QCD matter - The quenched approximation, QCD matter - The chiral limit, QCD matter - The AdS/CFT limit, QCD matter - Weak coupling theory

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In physics, it is everything that is constituted of elementary fermions. Matter occupies space and has mass. It is composed predominantly of atoms, which consist of protons, neutrons, and electrons. All gauge bosons (of which the photon is one), which mediate the four fundamental forces, are not considered matter, even though they certainly have energy and some also mass. Matter thus consists of quarks and leptons. There are six types of quarks (strange, charm, top, bottom, up, and down) which combine to form hadrons, primarily baryon ...

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Matter, Matter - Matter in Science

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Plasmas are the most common phase of matter. The entire visible universe outside the solar system is plasma: all we can see are stars. Since the space between the stars is filled with a plasma, although a very sparse one (see interstellar- and intergalactic medium), essentially the entire volume of the universe is plasma (see astrophysical plasmas). In the solar system, the planet Jupiter accounts for most of the non-plasma, only about 0.1% of the mass and 10−15 of the volume within the orbit of Pluto. Alfvén also noted that due to their electric charge, very small grains also behave as io ...

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Plasma physics, Plasma physics - Common plasmas, Plasma physics - Characteristics, Plasma physics - Plasma scaling, Plasma physics - Temperatures, Plasma physics - Densities, Plasma physics - Potentials, Plasma physics - In contrast to the gas phase, Plasma physics - Complex plasma phenomena, Plasma physics - Ultracold plasmas, Plasma physics - Mathematical descriptions, Plasma physics - Fluid, Plasma physics - Kinetic, Plasma physics - Particle-in-cell, Plasma physics - Fundamental plasma parameters, Plasma physics - Frequencies, Plasma physics - Lengths, Plasma physics - Velocities, Plasma physics - Dimensionless, Plasma physics - Miscellaneous, Plasma physics - Fields of active research

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