Transmittance

Transmittance is the measure of the fraction of incident light or radiation that passes through a material. It is an optical property of a material and is expressed as a percentage. The opposite of transmittance is absorbance or absorption, which is the measure of the amount of light or radiation that is absorbed by a material.

Definition

Transmittance is defined as the ratio of the intensity of the light that has passed through the material to the intensity of the light when it first hits the material. It is usually expressed as a percentage, with 100% transmittance meaning that all the light has passed through and none has been absorbed.

Calculation

The calculation of transmittance involves measuring the intensity of the light before and after it passes through the material. This can be done using a spectrophotometer, which measures the intensity of light at different wavelengths. The formula for transmittance is:

T = (I/I0) * 100%

where:

• T is the transmittance,
• I is the intensity of the light after it has passed through the material, and
• I0 is the intensity of the light before it hits the material.

Applications

Transmittance is a key concept in many fields, including physics, chemistry, and engineering. It is particularly important in the study of optics and spectroscopy, where it is used to determine the properties of materials and substances. For example, in environmental science, transmittance is used to measure the clarity of water, while in medicine, it is used in the analysis of blood samples.

See also

• Absorbance
• Reflectance
• Spectrophotometry

Transmittance Resources
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