What is diffusion GCSE BBC Bitesize?
Diffusion is the random movement of a substance from a region of high concentration to a region of low concentration (ie: down the concentration gradient). Substances (oxygen, carbon dioxide, water, dissolved nutrients and urea) can move into and out of a cell or organism via diffusion.
What is diffusion in biology?
Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. The difference in the concentration of a substance between two areas is called the concentration gradient .
What is diffusion GCSE AQA?
Particles (molecules and ions) in a liquid and a gas move continuously. If there is a situation where particles of a substance are in a higher concentration, they will move from this region to where they are in a lower concentration. This is called diffusion .
What is diffusion give example?
Diffusion is a physical process that refers to the net movement of molecules from a region of high concentration to one of lower concentration. For instance, a gas diffuses very quickly in another gas. An example of this is the way the noxious smell of ammonia gas spreads in air.
What is the definition of the process of diffusion?
Diffusion Definition “Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient.” Read on to explore what is diffusion and the different types of diffusion. What is Diffusion? Diffusion is the process of movement of molecules under a concentration gradient.
How does diffusion occur in the small intestine?
Products of digestion, dissolved in water, can pass across the wall of the small intestine by diffusion. Their concentration is higher in the small intestine than their concentration in the blood, so there is a concentration gradient from the intestine to the blood.
Why does diffusion and Brownian motion occur in liquids?
Their random motion because of collisions is called Brownian motion. Diffusion can also happen in liquids. This is because the particles in liquids can move around each other, which means that eventually they are evenly mixed. For example, potassium manganate (VII) is a purple solid.
How is diffusion related to the concentration gradient?
Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the molecules. The difference in the concentration of a substance between two areas is called the concentration gradient.