What is opacity definition?

Opacity is a term used to describe the degree of transparency or how much light can penetrate through a particular object, substance or material. It is the measure of how much an object or substance is able to obstruct or impede the penetration of light. In technical terms, opacity is expressed as a number between 0 and 1, where 0 represents complete transparency and 1 represents complete opacity or no transparency. The degree of opacity depends on factors such as the thickness, color, and density of the substance or material. The term is commonly used in fields such as optics, chemistry, and physics, to describe the behavior of light in various media.