What does percent transmittance mean?

Percent transmittance is a measure of the amount of light that passes through a substance compared to the initial intensity of light incident on it. It is expressed as a percentage, where 100% indicates that all the light has transmitted through the material, and 0% means no light has passed through. This concept is commonly used in fields like spectroscopy to analyze the properties of materials. Higher percent transmittance indicates greater transparency, while lower values suggest more absorption or reflection of light.