transmittance
Noun: - The fraction of radiant energy that passes through a substance: In physics and optics, transmittance is a measure of how much light or other electromagnetic radiation passes through a material without being absorbed or scattered. It is expressed as a ratio or percentage of the incident radiant flux that is transmitted.
Transmittance is a technical term used primarily in scientific contexts, such as optics, spectroscopy, and materials science. It quantifies the transparency of a medium to specific wavelengths of radiation.
- The transmittance of the new optical glass is over 95% for visible light.
- Scientists measured the infrared transmittance of the atmospheric sample.
- A low transmittance value indicates the material is opaque to that type of radiation.
- Internal Transmittance: Refers to the transmittance of a material itself, excluding losses due to surface reflection.
- Spectral Transmittance: Describes how transmittance varies with the wavelength of the incident radiation, often plotted on a graph.
- Transmit (verb): To cause (light, heat, sound, etc.) to pass through a medium.
- Transmission (noun): The act or process of transmitting. In physics, it can also refer to the fraction of incident radiation that is transmitted, closely related to transmittance.
- Transmissive (adjective): Having the property of transmitting radiation.
- Transmission Factor: A synonym often used in technical specifications.
- Transmissivity: In some contexts, particularly for homogeneous materials, this is used interchangeably with transmittance.
Transmittance is specifically a dimensionless ratio (from 0 to 1) or percentage. It should not be confused with: - Absorbance: A measure of the amount of light absorbed by a substance. - Opacity: The quality of being not transparent; the opposite of transmittance.
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the fraction of radiant energy that passes through a substance
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