What is diffusion rate?

Asked By: Melvy Bontempo | Last Updated: 21st March, 2020
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The rate of diffusion, dn/dt, is the change in the number of diffusing molecules inside the cell over time. Since the net movement of diffusing molecules depends on the concentration gradient, the rate of diffusion is directly proportional to the concentration gradient (dC/dx) across the membrane.

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Thereof, what is meant by rate of diffusion?

Definition of Diffusion rate (rate of diffusion) The number of randomly moving molecules that pass through a unit area per second. Diffusion rates are fastest when a large concentration difference exists on either side of the unit area.

Secondly, what is called diffusion? Diffusion is the movement of a fluid from an area of higher concentration to an area of lower concentration. Diffusion may also be thought of as the movement of particles down a concentration gradient. The term "diffusion" comes from the Latin word diffundere, which means "to spread out."

Furthermore, what is rate of diffusion in chemistry?

Graham's law of diffusion (also known as Graham's law of effusion) states that the rate of effusion a gas is inversely proportional to the square root of its molar mass. Often, it is used to compare the effusion rates of two gases.

What is diffusion example?

Diffusion Definition. 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.

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What is diffusion give example?

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. Carbon dioxide bubbles diffuse from an open soda, leaving it flat.

What is true diffusion?

What is true of diffusion? Diffusion requires energy input from the cell. Only water can diffuse across a cell membrane. Molecules move from areas of high concentration to areas of low concentration.

What does the rate of diffusion depend on?

The diffusion rate depends on several factors: the concentration gradient (the increase or decrease in concentration from one point to another); the amount of surface area available for diffusion; and the distance the gas particles must travel.

What are the types of diffusion?

The three main types of this phenomenon are expansion diffusion, stimulus diffusion, and relocation diffusion.

What happens during diffusion?


Diffusion is a process that occurs when a substance such as water, molecules, and ions, which are usually needed for various cellular processes, enter and leave cells. The way that cell diffusion happens is by molecules moving from an area of high concentration to an area of low concentration.

What is osmosis vs diffusion?

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.

What causes diffusion?

Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. The difference in the concentrations of the molecules in the two areas is called the concentration gradient. The kinetic energy of the molecules results in random motion, causing diffusion.

Is the rate of diffusion constant?

Since the net movement of diffusing molecules depends on the concentration gradient, the rate of diffusion is directly proportional to the concentration gradient (dC/dx) across the membrane. P is a constant relating the ease of entry of a molecule into the cell depending on the molecule's size and lipid solubility.

What is Graham's law formula?

Graham's Law is a relation which states that the rate of the effusion of a gas is inversely proportional to the square root of its density or molecular mass. Rate1 / Rate2 = (M2 / M1)1/2. Where: Rate1 is the rate of effusion of one gas, expressed as volume or as moles per unit time.

What is rate of diffusion measured in?


A rate is a quantity expressed per unit of time. For example, the speed you travel in your automobile is a rate, e.g., 80 miles/hour. So, diffusion rate is expressed as the amount of salt moved per time, e.g., 0.1 moles/sec.

Which gas has highest rate of diffusion?

The fastest diffusing gas will be AMMONIA.

Which gas diffuses the fastest?

According to Graham's law of diffusion, the rate of diffusion or movement of gas is inversely proportional to the square root of it's molecular weight. Among H2 , O2 , CO, and N2 , the gas with least mass is hydrogen. So hydrogen diffuses faster whereas oxygen takes long time to diffuse.

What is gas diffusion?

Diffusion is the process whereby gaseous atoms and molecules are transferred from regions of relatively high concentration to regions of relatively low concentration. Effusion is a similar process in which gaseous species pass from a container to a vacuum through very small orifices.

Why is diffusion so important in biology?

Diffusion is important to organisms because it is the process by which useful molecules enter the body cells and waste products are removed. Digested food molecules (amino acids, glucose) move down a concentration gradient from the intestine to the blood.

What is diffusion in chemistry?


Diffusion is the process of a substance spreading out to evenly fill its container or environment. In a solution, a concentrated solute diffuses to spread evenly in its solvent. This is the process where the particles move from high concentration to low concentration.

What is the formula for diffusion?

Graham's Law Formula
Graham's law states that the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molar mass. See this law in equation form below. In these equations, r = rate of diffusion or effusion and M = molar mass.

How do I calculate rates?

Calculating Rate
Simplify the rate by dividing each number by the greatest common factor. For example, the greatest common factor in 20 and 40 is 20. Dividing both sides by 20 results in 1 and 2. Express the rate as "1 mile per 2 minutes," or "1 mile:2 minutes."