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:''"Optical density" redirects here. "Optical density" can also refer to index of refraction.''In chemistry, absorbance or decadic absorbance is the ''common logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to ''transmitted'' spectral radiant power through a material. Absorbance is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for absorbance is discouraged.In physics, a closely related quantity called "optical depth" is used instead of absorbance: the ''natural logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material. The optical depth equals the absorbance times ln(10).The term absorption refers to the physical process of absorbing light, while absorbance does not always measure absorption: it measures attenuation (of transmitted radiant power). Attenuation can be caused by absorption, but also reflection, scattering, and other physical processes.==Mathematical definitions==
:''"Optical density" redirects here. "Optical density" can also refer to index of refraction.'' In chemistry, absorbance or decadic absorbance is the ''common logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to ''transmitted'' spectral radiant power through a material. Absorbance is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for absorbance is discouraged.〔 In physics, a closely related quantity called "optical depth" is used instead of absorbance: the ''natural logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material. The optical depth equals the absorbance times ln(10). The term absorption refers to the physical process of absorbing light, while absorbance does not always measure absorption: it measures attenuation (of transmitted radiant power). Attenuation can be caused by absorption, but also reflection, scattering, and other physical processes. ==Mathematical definitions==
抄文引用元・出典: フリー百科事典『 absorbance or decadic absorbance is the ''common logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to ''transmitted'' spectral radiant power through a material. Absorbance is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for absorbance is discouraged.In physics, a closely related quantity called "optical depth" is used instead of absorbance: the ''natural logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material. The optical depth equals the absorbance times ln(10).The term absorption refers to the physical process of absorbing light, while absorbance does not always measure absorption: it measures attenuation (of transmitted radiant power). Attenuation can be caused by absorption, but also reflection, scattering, and other physical processes.==Mathematical definitions==">ウィキペディア(Wikipedia)』 ■absorbance or decadic absorbance is the ''common logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to ''transmitted'' spectral radiant power through a material. Absorbance is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for absorbance is discouraged.In physics, a closely related quantity called "optical depth" is used instead of absorbance: the ''natural logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material. The optical depth equals the absorbance times ln(10).The term absorption refers to the physical process of absorbing light, while absorbance does not always measure absorption: it measures attenuation (of transmitted radiant power). Attenuation can be caused by absorption, but also reflection, scattering, and other physical processes.==Mathematical definitions==">ウィキペディアで「:''"Optical density" redirects here. "Optical density" can also refer to index of refraction.''In chemistry, absorbance or decadic absorbance is the ''common logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to ''transmitted'' spectral radiant power through a material. Absorbance is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for absorbance is discouraged.In physics, a closely related quantity called "optical depth" is used instead of absorbance: the ''natural logarithm'' of the ratio of incident to ''transmitted'' radiant power through a material. The optical depth equals the absorbance times ln(10).The term absorption refers to the physical process of absorbing light, while absorbance does not always measure absorption: it measures attenuation (of transmitted radiant power). Attenuation can be caused by absorption, but also reflection, scattering, and other physical processes.==Mathematical definitions==」の詳細全文を読む
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