The tendency of a gas or solute to pass from a point of higher pressure or concentration to a point of lower pressure or concentration and to distribute itself throughout the available space; a major mechanism of biological transport.
The tendency of gaseous, liquid, or solid molecules to move from an area of higher concentration to an area of lower concentration by constant random action.
In physiology, the passive movement of substances from an area of high concentration to one of low concentration.
The process of mixing a liquid with another liquid, or a gas with another gas.
The passing of a liquid or gas through a membrane.
A uniform distribution of solutes on both sides of a permeable membrane.
Diffusion is the movement of a substance (i.e., a solute in a solution) from an area of high concentration to an area of low concentration. When discussing nutrient absorption, diffusion is also called passive absorption.
Movement of particles from an area of high concentration to an area of low concentration to produce an even distribution in the available space.
Movement of molecules in a solution or a gas from an area of high concentration to one of low concentration.
The intermingling of substances, resulting in complete mixing. Diffusion involves the random movement of molecules or other small particles in a solution, tending toward uniform distribution throughout the available volume with no addition of energy. Diffusion plays a role in many physical phenomena, such as the transfer of oxygen from air in the lungs to the bloodstream. Typically, substances diffuse from an area of high concentration to an area of lower concentration.
The tendency of the molecules of a substance (gas, liquid, or solid) to move from a region of high concentration to one of lower concentration. In the body, oxygen and carbon dioxide move by diffusion. The diffusion of water to an area of greater solute concentration is called osmosis.
As the temperature rises, there is a phenomenon of molecular rearrangement occurring within substances.
The passive transport of molecules across a membrane occurs when they move from an area of higher concentration to an area of lower concentration.
The phenomenon known as diffusion involves the movement of molecules of a substance within a fluid, spreading from an area of higher concentration to an area of lower concentration. This process leads to the establishment of a uniform concentration throughout the fluid medium.