About
Brownian motion
This is a simulation of brownian motion of a particle that collides with a large set of smaller particles which move with uniform motion in different random directions.
For more info:
http://weelookang.blogspot.sg/2010/06/ejs-open-source-brownian-motion-gas.html
Original Author:
Simulación preparada por Francisco Esquembre para el libro
Creación de Simulaciones Interactivas en Java.
Aplicación
a la Enseñanza de la Física
(C) Pearson Educación 2004.
Modified by Fu-Kwun Hwang
http://www.phy.ntnu.edu.tw/ntnujava/
Translations
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Credits
Francisco Esquembre; Fu-Kwun Hwang; lookang
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surprisingly similiar random movement between brownian and diffusion.
Key inquiry question: How can we explain the effects of heat gain or heat loss on matter?
2. Brownian motion
• Brownian motion provides evidence of the movement of molecules. Pollen grains in water and smoke particles in air are observed to be in constant random motion due to collisions by the unseen fastmoving molecules of water and air respectively
Other Resources
http://mw.concord.org/nextgen/interactives/
Add a drop of dye anywhere in the container, and watch it diffuse through the water.
Click in the model to add a drop of dye. Watch how the molecules move through the water. Trace an individual molecule to see how it moves through the liquid.
http://lab.concord.org/embeddable.html#interactives/sam/diffusion/1-dropping-dye-on-click.json
How does temperature affect the rate of diffusion?
Explore the role of temperature on the rate of diffusion. Set the temperature, then remove the barrier, and measure the amount of time it takes the blue molecules to reach the gas sensor. When the gas sensor has detected three blue molecules, it will stop the experiment. Compare the diffusion rates at low, medium and high temperatures. Trace an individual molecule to see the path it takes.
http://lab.concord.org/embeddable.html#interactives/sam/diffusion/2-temperature.json
How does molecular mass affect the rate of diffusion?
Explore the role of molecular mass on the rate of diffusion. Select the mass of the molecules behind the barrier. Remove the barrier, and measure the amount of time it takes the molecules to reach the gas sensor. When the gas sensor has detected three molecules, it will stop the experiment. Compare the diffusion rates of the lightest, heavier and heaviest molecules. Trace an individual molecule to see the path it takes.
http://lab.concord.org/embeddable.html#interactives/sam/diffusion/3-mass.json
How does pore size affect the diffusion of different molecules?
Biological membranes are selectively permeable; some molecules can cross while others cannot. One way to affect this is through pore size. Change the pore size with the slider to change the permeability of the membrane to the different types of molecules. Trace an individual molecule to see the path it takes.
Cell membranes are composed of two layers of phospholipids (a phospholipid bilayer). Some molecules are capable of crossing this membrane directly, without use of specific membrane channels.
Oxygen and carbon dioxide are two molecules that can freely cross the cell membrane. In aerobic cells, oxygen is necessary for cell functioning and carbon dioxide is produced as a waste molecule. Hence, the cell “wants” oxygen to enter and carbon dioxide to leave. But molecules don’t move only in one direction–they diffuse randomly across the membrane.
Set up the model with high oxygen and low carbon dioxide outside the cell and low oxygen and high carbon dioxide inside the cell. In which direction do the oxygen and carbon dioxide molecules move?
http://lab.concord.org/embeddable.html#interactives/sam/diffusion/5-permeable-membrane.json
How does pore size affect the diffusion of different molecules?
Biological membranes are selectively permeable; some molecules can cross while others cannot. One way to affect this is through pore size. Change the pore size with the slider to change the permeability of the membranes to the different types of molecules. Trace an individual molecule to see the path it takes.
Video
https://www.youtube.com/watch?v=gPMVaAnij88 by STEM Learning
Versions:
Other resources
http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1121.0 simplied flu spreading model by Fu-Kwun Hwang
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- Details
- Parent Category: 12 Temperature & Ideal Gases
- Category: 01 Kinetic Model
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