∞ generated and posted on 2020.12.19 ∞
Osmosis is the movement of water molecules down a concentration gradient while tonicity is a measure of whether water will move out of a cell (or not).
| The goal of the presented videos is to foster an appreciation for the concept of osmosis especially as it can impact biological systems, along with the related concept of tonicity. By way of introduction to these various topics, consider also the concepts of solute, solvent, solution, concentration, down a concentration gradient, osmolarity, osmosis, hypertonic solution, hypotonic solution, and isotonic solution. |
This video goes through the class "U" tube experiment illustrating osmosis and osmotic pressure.
The above video provides a short visualization of osmosis though doesn't stress the importance of how collision with the membrane is limiting to movement across it.
The above video describes the concepts of osmosis, hypertonic solutions, hypotonic solutions, and isotonic solutions, all in terms of a nice experiments using dialysis tubing indicating the impact of osmosis on cell volume.
The above video describes the concepts of osmosis, hypertonic solutions, hypotonic solutions, and isotonic solutions, all really nicely done, save for some math issues, using eggs with dissolved shell as shrinking and expanding cells.
The above video considers plasmolysis/crenation; nicely shown is the contraction of the cytoplasm of onion cells while in hypertonic solution.
The above video considers osmosis and particularly reverse osmosis, best viewed starting at 0:45 and going to 4:15.