läbipaistmatu

Läbipaistmatu is an Estonian word that translates to "opaque" in English. It describes a material or substance that does not allow light to pass through it. This means that objects cannot be seen through an opaque material. The degree of opacity can vary greatly, from substances that are slightly translucent, allowing some light to filter through, to those that are completely impenetrable to light.

In physics, opacity is a measure of how much light is blocked by a material. It is related to the material's absorption and scattering properties. Different materials have different opacities depending on their composition and structure. For example, glass is typically transparent, allowing light to pass through freely, while wood is opaque. Paint is designed to be opaque to cover surfaces and create a uniform color.

The concept of läbipaistmatu is also used metaphorically. It can refer to something that is difficult to understand, unclear, or secretive. For instance, a complex process or a hidden motive might be described as läbipaistmatu, implying a lack of transparency or clarity. This metaphorical usage highlights the idea of something being hidden or obscured, much like an opaque object hides what is behind it.