Lead is most often used as an insulation for X-rays. It blocks X-rays. That is what is inside those blankets dentists put over you when they X-ray your teeth.
radiolucent allows x-ray pass through radiopaque does not allow it to pass through
An opaque substance does not allow light to pass through it. Examples include wood, metal, and thick plastics.
Rubber.
An opaque material does not allow light to pass through it. These materials typically reflect or absorb light, preventing it from transmitting through the substance. Examples include metals, wood, and thick plastics.
A transparent substance allows light to pass through it freely, resulting in visibility through the material. In contrast, an opaque substance blocks light from passing through, making it impossible to see through the material.
Insulators, such as wool, styrofoam, or air, do not allow heat to pass through easily because they have low thermal conductivity. This property makes them useful for keeping things warm or cool.
An impermeable rock that does not allow water to pass through is called a impermeable rock, such as shale or clay. These rocks have very low porosity and permeability, preventing water from flowing through them.
Insulators - they cannot allow electricity to flow through them as they have no mobile charge carriers present. Insulators - they cannot allow electricity to flow through them as they have no mobile charge carriers present.
A substance that does not let heat pass through it is called an insulator. Insulators are materials that have low thermal conductivity, meaning they are poor conductors of heat. This property allows them to prevent the flow of heat energy.
Transparency is a physical property of a substance that describes how much light can pass through it. It is not a chemical change since the substance remains the same chemically, only its ability to allow light to pass through changes.
Aquaporins allow water molecules to pass through cell membranes.
differentialy permeable means, a substance which allow only certain materials to pass through it. For eg., a plant cell wall acts as a differentially permeable membrane which allow only certain materials like water, certain ions etc to pass through it.