Transmitanssi

Transmitanssi is a Finnish term that translates to "transmittance" in English. It refers to the optical property of a material that describes how much light passes through it. Specifically, transmittance quantifies the ratio of the intensity of light that emerges from a material to the intensity of the light that enters it. A high transmittance value indicates that most of the incident light passes through the material, while a low value suggests that much of the light is absorbed or reflected.

Transmitanssi is typically expressed as a dimensionless value between 0 and 1, or as a percentage ranging from 0% to 100%. For example, a perfectly transparent material like clear glass would have a transmittance close to 1 (or 100%), meaning almost all light passes through. Conversely, an opaque material like a brick would have a transmittance close to 0 (or 0%), as virtually no light can penetrate it.

The transmittance of a material is dependent on several factors, including the material's composition, thickness, surface properties, and the wavelength of the incident light. For instance, colored glass transmits certain wavelengths of light more readily than others, which is why we perceive its color. Understanding transmittance is crucial in various fields, such as optics, material science, and engineering, for applications ranging from window design to the development of optical filters and sensors.