a change in the physical state of a substance; e.g. melting, vaporization, boiling, etc.
A technology for rewritable optical discs using a physical effect in which a laser beam heats a recording material to reversibly change an area from an amorphous state to a crystalline state, or vice versa. Continuous heat just above the melting point creates the crystalline state [an erasure] while high heat followed by rapid cooling creates the amorphous state [a mark].
a change from one state (solid or liquid or gas) to another without a change in chemical composition
a change in kind for the network
a change of the state of matter, like water to steam (or ice), or amorphous (non-crystalline) to crystalline, or vice versa
a drastic alteration in properties of a sample of matter when it transitions from one form to another -- for example, the changing of liquid water into steam
a noticeable and sudden change in program behavior (similarity) over time (as if going from one phase to another phase)
a physical change in which a substance changes from one state of matter to another
a deliberate change made to the events and conditions in the learner's environment in an attempt to increase the improvement index. A phase change is signified by a vertical line drawn to separate the phases on a Standard Celeration Chart.
Changing from a solid to a liquid, as in the case of melting ice becoming water. During this process, cold is released gradually as the substance changes from one phase to the next. Ice or ice-like substances exhibiting phase change have a gradual drop in temperature. This is considered more suitable for ice therapy, lessening the chance of skin damage.
Alteration of biological windows of a system causing functional changes.
The process by which a substance transforms from solid to liquid or liquid to gas, as well as transformations in the reverse direction.
State change of a recording layer caused by introduction of energy, resulting in information storage detectable by differences in optical properties of the physically different states.
Phase-change technology uses an amorphous coating in which individual spots on the disk are changed by laser irradiation from a crystalline state, which reflects light, to a non-crystalline state, which absorbs light
A method of storing information or rewritable optical disks.
A technology for re-writable optical discs in which a laser beam heats a recording material to reversibly change an area from an amorphous (dull) to a crystalline (reflective) state, or vice versa. (Alternative to dye sublimation)
A method of storing information on rewritable optical disks.
An optical storage technology in which the disk drive writes data with a laser that changes dots on the disk between amorphous and crystalline states. An optical head reads data by detecting the difference in reflected light from amorphous and crystalline dots. When full a phase-change disk can be erased (or "reformatted") using a medium-intensity pulse to restore the original crystalline structure. CD-RW, DVD-RAM and some earlier optical drives use phase-change technology.
Reorganization of a substance at the atomic or molecular level resulting in a change of the physical state of matter. For example, a change from solid to liquid to a gas.
The process of changing from one physical state (solid, liquid, or gas) to another, with a necessary or coincidental input or release of energy.
(Or phase transformation.) A thermodynamic process in which a substance changes from one phase to another. A phase change entails discontinuity. At a given temperature, two phases of a pure, homogeneous substance are characterized by different enthalpies (and entropies), and the enthalpy difference is called latent heat. The phase transitions of greatest importance to meteorology are those between water vapor, liquid water, and ice.