Diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is the perfume of a flower that quickly permeates the still air of a room.

What is diffusion?

1. Diffusion is the movement of a substance from an area of high concentration to an area of low concentration.
2. Diffusion happens in liquids and gases because their particles move randomly from place to place.

Diffusion is the movement of molecules from high concentration to low concentration. Air particles possess energy. Particles start moving randomly. They bump and bounce into one another.

Diffusion is a process where molecules of a material move from an area of high concentration (where there are many molecules) to an area of low concentration (where there are fewer molecules)until it has reached equilibrium (molecules evenly spread).

The three types of diffusion are – simple diffusion, osmosis and facilitated diffusion.

• (i) Simple diffusion is when ions or molecules diffuse from an area of high concentration to an area of low concentration.
• (ii) In osmosis, the particles moving are water molecules.

Transmission of water into cells is not an example of diffusion.

Examples of Diffusion

• Perfume is sprayed in one part of a room, yet soon it diffuses so that you can smell it everywhere.
• A drop of food coloring diffuses throughout the water in a glass so that, eventually, the entire glass will be colored.

Examples of diffusion in living organisms Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs: oxygen moves down a concentration gradient from the air in the alveoli to the blood. carbon dioxide moves down a concentration gradient from the blood to the air in the alveoli.

Diffusion is very important in the body for the movement of substances eg the movement of oxygen from the air into the blood and carbon dioxide out of the blood into the air in the lungs, or the movement of glucose from the blood to the cells.

The diffusion of chemicals and gases in and out of cells is an essential activity in human organs. Diffusion of oxygen and carbon dioxide gas occurs in the lungs. Diffusion of water, salts, and waste products occurs in the kidneys. Diffusion of calcium from food into cells occurs in the intestines.

1. You can smell perfume because it diffuses into the air and makes its way into your nose. 2. Cigarette smoke diffuses into the air.

The smell of perfumes/Incense Sticks. Opening the Soda/Cold Drinks bottle and the CO2 diffuses in the air. Dipping the tea bags in hot water will diffuse the tea in hot water. Small dust particles or smoke diffuse into the air and cause air pollution.

Diffusion is important to cells because it allows them to gain the useful substances they require to obtain energy and grow, and lets them get rid of waste products….Importance of diffusion to living organisms.

Diffusion- The mixing of a substance with another substance due to the motion or movement of its particles is called diffusion. It is one of the properties of materials. The diffusion of one substance into another substance goes on until a uniform mixture is formed. Diffusion takes place in gases, liquids and solids.

Plasmolysis is the process in which cells lose water in a hypertonic solution. The reverse process, deplasmolysis or cytolysis, can occur if the cell is in a hypotonic solution resulting in a lower external osmotic pressure and a net flow of water into the cell.

Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution. Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration. The overall effect is to equalize concentration throughout the medium.

Acceleration: It is a measure of the change in the velocity of an object per unit time. Acceleration can be caused either by change in direction of motion or change in speed or both.

It is defined as rate of change of velocity with time. If a body moves with uniform velocity its acceleration will be zero because its velocity is zero. Uniform acceleration. A body has a uniform acceleration if it travels in a straight line and its velocity increases by equal amount in equal intervals of time.

A positive acceleration means an increase in velocity with time. negative acceleration means the speed reduces with time. When an object is speeding up, the acceleration is in the same direction as the velocity.

Average Speed- It is defined as the total path length travelled divided by the total time interval during which the motion has taken place.

It is Distance travelled by body per unit of time. It is Distance travelled by body per unit of time in a given direction. It only has Magnitude.

The formula to find a velocity is: v= s/t.

Distance is a numerical measurement of how far apart objects or points are. In physics or everyday usage, distance may refer to a physical length or an estimation based on other criteria (e.g. “two counties over”). The distance from a point A to a point B is sometimes denoted as.

Work Done. Work done on an object is defined as the product of the magnitude of the force acting on the body and the displacement in the direction of the force. W = F.s. If a force acting on a body causes no displacement, the work done is 0. For example, pushing a wall.

Learn how to find the distance between two points by using the distance formula, which is an application of the Pythagorean theorem. We can rewrite the Pythagorean theorem as d=√((x_2-x_1)²+(y_2-y_1)²) to find the distance between any two points.

Mass Formulas – Difference Between Mass and Weight Mass is a quantity that gives an idea about how much matter is present in an object. It is a quantitative measure of inertia. So acceleration is inversely proportional to inertia. The relation between force and mass is given by: F = ma or m = F/m.

Work can be calculated with the equation: Work = Force × Distance. The SI unit for work is the joule (J), or Newton. One joule equals the amount of work that is done when 1 N of force moves an object over a distance of 1 m.

The formula is a fact or a rule written with mathematical symbols. It usually connects two or more quantities with an equal to sign. When you know the value of one quantity, you can find the value of the other using the formula.