Examples of using Emissivity in English and their translations into Vietnamese
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Colloquial
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Ecclesiastic
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Computer
Spectral hemispherical emissivity in frequency and spectral hemispherical emissivity in wavelength of a surface, denoted εν and ελ respectively,
thermal radiation very well; it has an emissivity as large as 0.97, and hence soot is a fair approximation to an ideal black body.[13][14].
reliable calibrations because emissivity is radiometrically calibrated, and the target size
Passive thermography uses sensors to measure the wavelength of the emitted radiation and if the emissivity is known or can be estimated,
Low-E windows" with transparent low emissivity coatings emit less thermal radiation than ordinary windows.[2] In winter, these coatings can halve the rate at which a window loses heat compared
Emissivity of a planet is determined by the nature of its surface and atmosphere.[6] Temperature measurements- Pyrometers
For example, the Fluke 561 Infrared Thermometer enables you to set emissivity to"High"(for measuring most surfaces, such as wood, paint,
Effective temperature is often used as an estimate of a body's surface temperature when the body's emissivity curve(as a function of wavelength)
Effective temperature is often used as an estimate of a body's temperature when the body's emissivity curve(as a function of wavelength)
Emissivities are important in several contexts.
These emissivities are the total hemispherical emissivities from the surfaces.
Water, snow and frost have relatively high emissivities approx.
which have emissivities close to the maximum possible value of 1.0.
Emissivities ε can be measured using simple devices such as Leslie's cube in conjunction with a thermal radiation detector such as a thermopile
For measuring room temperature emissivities, the detectors must absorb thermal radiation completely at infrared wavelengths near 10×10- 6 metres.[9]
Kirchhoff's Law explains why emissivities cannot exceed 1, since the largest absorptivity- corresponding to complete absorption of all incident light by a truly black object- is also 1.[7] Mirror-like, metallic surfaces that reflect light will thus have low emissivities, since the reflected light isn't absorbed.
Target Emissivity: Fixed at 0.95.
Emissivity measurements for many surfaces are compiled in many handbooks and texts.
Hemispherical emissivity of a surface, denoted ε, is defined as[8].
Emissivity is how well the surface of an object radiates infrared energy.