Question

What is Osmosis ? Can You Help me ? .

Answer 1

It's diffusion of water through a semi-permeable membrane (a membrane that's semi-porous) from an area of low solute concentration (less stuff in the water) to an area of high solute concentration (more stuff in the water). Or in other words, water will flow from an area of high pressure to an area of low pressure.

Here's a way to look at it, that'll be helpful for you.
A hypertonic solution is a solution that has lots of stuff in it. What happens when you have lots of stuff in the water? Well you're going to have LESS water. Right? A hypotonic solution is a solution that has less stuff in it. When there's less stuff in it, there's going to be a lot more water.

In nature everything needs to be balanced, something called equilibrium. Whenever you place a cell in a solution that is hypertonic (lots of stuff in it), the solution is obviously going to have less water than the cell. So what happens is the cell's water flows outwards into the solution to balance out. Because all the water flows out of the cell, the cell has little water left and so it shrinks in size. Another way to think of it is the water went from an area of high concentration (the cell) to an area of low concentration (the surrounding solution).

If you place the same cell in a hypotonic solution (a solution that has less stuff and more water), the cell will then have more stuff in it than the surrounding solution. Because the cell has more stuff in it, that means the water in it is less than the surrounding solution. In other words, the amount of water in the solution is higher than the cell. So the water flows INTO the cell, causing it to swell up. Another way to think of it is the water went from an area of high concentration (the surrounding solution) to an area of low concentration (the cell).

Answer 2

Thanks Again

Answer 3

Welcome !

Answer 4

http://answers.yahoo.com/question/index?qid=20100209063639AAiQqkW

Answer 5

a short 0ne

Answer 6

Osmosis is a process in which a fluid passes through a semipermeable membrane, moving from an area in which a solute such as salt is present in low concentrations to an area in which the solute is present in high concentrations. The end result of osmosis, barring external factors, will be equal amounts of fluid on either side of the barrier, creating a state which is known as “isotonic.” The fluid most commonly used in demonstrations of osmosis is water, and osmosis with a wide variety of fluid solutions is key for every living organism on Earth, from humans to plants.

There are some key terms related to osmosis which may be helpful to know when thinking about how osmosis works. The fluid which passes through the membrane is known as a solvent, while the dissolved substance in the fluid is a solute. Together, the solvent and dissolved solute make up a solution. When a solution has low levels of a solute, it is considered to be hypotonic, while solutions with high solute levels are known as hypertonic.