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“emission”
1. The act of causing to flow out: Tipping the filled water pitcher on its side caused the emission of all the water, which poured out onto the table.
2. The outpouring of a liquid from a pipe: When the farmer turned the water main on, there was an emission of water from the concrete conduit as it flowed into the orchard to water the trees.
3. The action of small particles or substances moving away from a central source: The emission of heat from the fireplace soon warmed the entire room.
4. One of a number of ways in which something may be discharged out of the body: Coughing is a way to facilitate the emission of phlegm from the throat.
5. Something that has been discharged or released from the body: Dr. Smith sent a sample of the emission of pus from the patient's wound to the laboratory to be analyzed.
2. The outpouring of a liquid from a pipe: When the farmer turned the water main on, there was an emission of water from the concrete conduit as it flowed into the orchard to water the trees.
3. The action of small particles or substances moving away from a central source: The emission of heat from the fireplace soon warmed the entire room.
4. One of a number of ways in which something may be discharged out of the body: Coughing is a way to facilitate the emission of phlegm from the throat.
5. Something that has been discharged or released from the body: Dr. Smith sent a sample of the emission of pus from the patient's wound to the laboratory to be analyzed.
This entry is located in the following units:
miss-, mis-, -miss, -mis, mit-, mitt-, -mit, -mitt
(page 3)
-sion, -sions
(page 4)
(essential physics of the emission of attosecond light pulse)
Word Entries containing the term:
“emission”
electron emission
1. The release of electrons from a specific material into the surrounding area or space.
It may be caused by an electric field, light, heat, or impact chemical disintegration.
2. A liberation of electrons from a substance into a vacuum.Since all substances consist of atoms and since all atoms contain electrons, any substance may emit electrons; usually, however, the term refers to the emission of electrons from the surface of a solid.
3. The freeing of electrons into space from the surface of a body under the influence of heat, light, impact, chemical disintegration, or a potential difference.
This entry is located in the following units:
electro-, electr-, electri-
(page 48)
-tron, -tronic, -tronics +
(page 4)
electronic emission spectrum
1. Any spectrum produced by the emission of electromagnetic radiation by atoms, molecules, or ions, because of electron excitation or the signal voltage that is applied to the control electrode of an electron tube.
2. A spectrum resulting from the emission of electromagnetic radiation by ions, atoms, and molecules following excitations of their electrons.
2. A spectrum resulting from the emission of electromagnetic radiation by ions, atoms, and molecules following excitations of their electrons.
This entry is located in the following units:
electro-, electr-, electri-
(page 62)
-tron, -tronic, -tronics +
(page 9)
gamma decay, gamma emission
A quantum transition between two energy levels of a nucleus in which a gamma ray is emitted.
This entry is located in the following unit:
gamma; Γ, γ +
(page 1)
ion emission
The ejection of ions from the surface of a substance or medium into the surrounding space, because of the influence of an electric field or heat.
This entry is located in the following unit:
ion, ion- +
(page 2)
thermionic emission
1. The emission of electrons or ions by substances that are highly heated, the charged particles being called thermions.
2. The discharge of electrons or ions from a solid or liquid as a result of its thermal energy.
3. The release of electrons when a material is heated; for example, electron emission when the tungsten cathode filament of a radiographic tube is heated to incandescence (emission of light by an object as a result of its being heated to a high temperature) by means of its low-voltage heating circuit.
2. The discharge of electrons or ions from a solid or liquid as a result of its thermal energy.
3. The release of electrons when a material is heated; for example, electron emission when the tungsten cathode filament of a radiographic tube is heated to incandescence (emission of light by an object as a result of its being heated to a high temperature) by means of its low-voltage heating circuit.
This entry is located in the following unit:
thermo-, therm-, thermi-, -thermia, -therm, -thermal, -thermic, -thermias, -thermies, -thermous, -thermy
(page 23)
Word Entries at Get Words containing the term:
“emission”
There are three main types of celestial radio emissions:
- Thermal emissions which occur as a result of the acceleration of electrically-charged particles in a hot gas.
- Synchrotron or non-thermal, emissions are produced by the acceleration of charged particles, but the acceleration is caused by a magnetic field.
- Radio spectral-line emissions are concentrated in a narrow band around one specific frequency; just as an optical spectral line corresponds to a single frequency in the visible electromagnetic spectrum.
Radio line emissions usually originate in clouds of hydrogen gas, a relatively common constituent of the universe, which is found in our galaxy's spiral arms, among other places.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 6)
Extra radiation at certain specific wavelengths in a spectrum, compared with neighboring wavelengths (colors): An emission line is a spectral line occurring from emissions of electromagnetic radiation by atoms, ions, or molecules in the course of changes from agitated states to conditions of lower energy.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 9)
An immense cloud in interstellar space which, as a result of ionized gas within it, shines by its own light: An emission nebula is a gas cloud that receives energy from a hot star, allowing it to give off radiation in emission lines, such as those of hydrogen.
The characteristic reddish radiation of many emission nebulae is mostly from the hydrogen-alpha line.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 9)
A spectrum of electromagnetic radiation sent off by a self-luminous source: An emission spectrum is the spectrum formed by the emission of electromagnetic radiation by a source, such as a star.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 9)
Electromagnetic radiation emitted or absorbed at discrete frequencies or wavelengths: A spectrum of line emission occurs when a hot gas gives off certain wavelengths of illumination which then produces lines on a dark background.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 14)
The discharge of electrons from very hot substances: Thermal emission is the type of electromagnetic radiation emitted when electrons and atoms, forming part of a hot gas, interact by collisions. The resulting radiation is continuous, as opposed to discrete, line emission.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 26)