You may be referring to the process of osmosis.
Some glass is transparent to visible light.
A substance that allows light to pass through it is called transparent. This means that it doesn't obstruct or absorb the light rays passing through it, allowing them to pass through with minimal reflection or refraction. Examples of transparent substances include glass, water, and air.
When a substance transmits no light, it means that the substance absorbs all the light that comes in contact with it, preventing it from passing through. This could be due to the substance's molecular structure or composition, which causes it to absorb all wavelengths of light rather than allowing them to pass through.
allowing some substance to pass into the cell and blocking others
trait
trait
A substance that allows heat and electricity to pass through is called a conductor. Conductors have high electrical and thermal conductivity, allowing energy to flow through them easily. Metals like copper and aluminum are common examples of good conductors.
An opaque substance does not allow light to pass through it. Examples include wood, metal, and thick plastics.
plasma protein
Rubber.
a medium.
Filtration involves the passage of a liquid or gas through a porous material to separate solids or contaminants. The substance traps particles that are larger than its pores, allowing the clean liquid or gas to pass through. Trickle is a slower, gradual movement of a substance through a porous material due to gravity or capillary action.