what is diffusion?

Question

oh ya and what does this mean leaching is the process in which nitrogen is lost into ________, ___________, and _________.

Answer 1

Diffusion - the process by which molecules spread from areas of high concentratiion, to areas of low concentration. When the molecules are even throughout a space - it is called EQUILIBRIUM.

Diffusion is the net action of matter (particles or molecules), heat, momentum, or light whose end is to minimize a concentration gradient. The process of diffusion, therefore, minimizes thermodynamic Gibbs free energy (though, it is not a chemical reaction), and is thus a spontaneous process (more familiarly known as a "passive" form of transport, rather than "active"). An example of diffusion is seen when one cooks spaghetti, where water diffuses into the sponge-like structure of the dry and stiff pasta.

The different forms of diffusion can be modeled quantitatively using the diffusion equation, which goes by different names depending on the physical situation. For instance - steady-state bi-molecular diffusion is governed by Fick's law, steady-state thermal diffusion is governed by Fourier's law. The diffusion of electrons in an electrical field leads essentially to Ohm's law that is further explained by Einstein relation. The generic diffusion equation is time dependent, and as such applies to non-steady-state situations as well.

In all cases of diffusion, the net flux of the transported quantity (atoms, energy, or electrons) is equal to a physical property (diffusivity, thermal conductivity, electrical conductivity) multiplied by a gradient (a concentration, thermal, electric field gradient). Noticeable transport occurs only if there is a gradient - for example in thermal diffusion, if the temperature is constant, heat will move as quickly in one direction as in the other, producing no net heat transport or change in temperature.

Diffusion can be measured, by the means of concentration gradient. A concentration gradient is the difference between the high concentration and the low concentration. It also determines how fast diffusion occurs.

When soil becomes excessively wet through rainfall, the soil will reach a point where it cannot hold any more water. This happens because the air spaces between soil particles become filled with water. As these air spaces fill, gravity will cause water to move down through the soil profile. (It can also pound or run off the surface of the soil.) As water moves down through the soil, nitrogen can be carried with it. This is called leaching.

Nitrate (NO3-) is primarily the form of nitrogen that is leached. Nitrates may originate from manures, the decay of plants and other organic materials or from fertilizers. Nitrate is very mobile and is easily moved by water. Other forms of nitrogen, such as ammonium (NH4+), generally do not leach.Unlike nitrate, the ammonium form does not leach because it is attached to the soil and resists movement with water. The forces that cause ammonium to attach to the soil are somewhat like the forces that cause metal objects to become attached to a magnet.

leaching is the process in which nitrogen is lost into soil and groundwater.

Answer 2

Diffusion is the net action of matter (particles or molecules), heat, momentum, or light whose end is to minimize a concentration gradient. The process of diffusion, therefore, minimizes thermodynamic Gibbs free energy (though, it is not a chemical reaction), and is thus a spontaneous process (more familiarly known as a "passive" form of transport, rather than "active"). An example of diffusion is seen when one cooks spaghetti, where water diffuses into the sponge-like structure of the dry and stiff pasta. (Note that the heat provided by cooking does not cause but expedites this process).


You can probably find the answer to your other question on the source I used.

Answer 3

Diffusion is when substances try to equal the concentration. For example if there is 100% water in a cell and 100%salt on the outside of the cell, 50% of each will diffuse so that there is 50% salt and 50%water inside and 50% salt and 50% water outside.

Answer 4

Something goes from here to there because there is a local gradient in energy density or pressure (same units). The material flow is from high to low pressure. Since such a flow is only a consequence of the Second Law of thermodynamics, pretty much anything that happens can be termed diffusion.

https://www.electrikals.com

Answer 5

Diffusion is the process in which particles spread into the total area they have to spread to evenly. Like when you put cream in coffee, the coffee is dark at 1st then as you stir it becomes a uniform lighter brown from milk diffusing through.

Answer 6

the soil groundwater