- published: 08 Apr 2015
- views: 127332
Diffusion is the net movement of molecules or atoms from a region of high concentration (or high chemical potential) to a region of low concentration (or low chemical potential). This is also referred to as the movement of a substance down a concentration gradient. A gradient is the change in the value of a quantity (e.g., concentration, pressure, temperature) with the change in another variable (usually distance). For example, a change in concentration over a distance is called a concentration gradient, a change in pressure over a distance is called a pressure gradient, and a change in temperature over a distance is a called a temperature gradient.
The word diffusion is derived from the Latin word, "diffundere", which means "to spread out" (if a substance is “spreading out”, it is moving from an area of high concentration to an area of low concentration). A distinguishing feature of diffusion is that it results in mixing or mass transport, without requiring bulk motion (bulk flow). Thus, diffusion should not be confused with convection, or advection, which are other transport phenomena that utilize bulk motion to move particles from one place to another.
You will learn about "Diffusion" in this video. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. Consider a container in which there are some air particles on one side. These molecules possess energy. They will start moving randomly, bouncing and bumping into each other. Eventually these molecules will start spreading out and fill the entire container. This is the concept of diffusion. @Subscribe on Youtube: http://www.youtube.com/user/Smartlearningforall?sub_confirmation=1 @Facebook: https://www.facebook.com/smartlearningforall @Twitter: https://www.twitter.com/SmartLearningFA
Learn about diffusion, osmosis, and concentration gradients and why these are important to cells. Watch the next lesson: https://www.khanacademy.org/science/biology/membranes-and-transport/passive-transport/v/passive-transport-and-selective-permeability?utm_source=YT&utm;_medium=Desc&utm;_campaign=biology Missed the previous lesson? https://www.khanacademy.org/science/biology/membranes-and-transport/diffusion-and-osmosis/v/hypotonic-isotonic-and-hypertonic-solutions-tonicity?utm_source=YT&utm;_medium=Desc&utm;_campaign=biology Biology on Khan Academy: Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. Dive in to learn more about the many branches of biology and...
Understanding how particles passively diffuse down their concentration gradient. Watch the next lesson: https://www.khanacademy.org/science/biology/membranes-and-transport/diffusion-and-osmosis/v/concentration-gradients?utm_source=YT&utm;_medium=Desc&utm;_campaign=biology Missed the previous lesson? https://www.khanacademy.org/science/biology/membranes-and-transport/the-plasma-membrane/v/fluid-mosaic-model-of-cell-membranes?utm_source=YT&utm;_medium=Desc&utm;_campaign=biology Biology on Khan Academy: Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology is the study of the fascinating and intricate systems that make life possible. Dive in to learn more about the many branches of biology and why they are exciting and important. Covers topics ...
This is a video lesson about diffusion that describes how substances move from an area of high concentration to an area of low concentration across a semi-permeable membrane. The process of diffusion is passive and very similar to osmosis (a special case of diffusion for water). For more Biology video lessons check out www.anytimeeducation.com
Pen ink consists of several ingredients. One of them is a dye which imparts color to the ink. When we add a drop of ink into the cold water, the ink is mixed with it by means of diffusion - dispersion of particles of ink ingredients in the water. The warm water diffusion occurs faster because the particles have more energy, and the spaces between them are larger (more easily with each other squeeze). Music from http://www.youtube.com/audiolibrary First Day - Huma-Huma 1:59
Follow @science_sauce on Twitter to stay updated on new videos. www.twitter.com/science_sauce GCSE level video describing osmosis and diffusion, including concentration gradients, rates of diffusion, water potential, the effect on plant and animal cells, and examples with sucrose solution.
Hank describes how cells regulate their contents and communicate with one another via mechanisms within the cell membrane. Crash Course Biology is now available on DVD! http://dftba.com/product/1av/CrashCourse-Biology-The-Complete-Series-DVD-Set Like CrashCourse on Facebook: http://www.facebook.com/youtubecrashcourse Follow CrashCourse on Twitter: http://www.twitter.com/thecrashcourse "Concert" music used with permission from Chameleon Circuit. This video uses sounds from Freesound.org: a list of these sounds can be found in the Google document here, along with the citations for this video: http://dft.ba/-1ZRl Table of Contents time codes: 1) Passive Transport - 1:17 2) Diffusion - 1:25 3) Osmosis - 2:12 4) Channel Proteins- 4:37 5) Active Transport - 4:58 6) ATP - 5:37 7) Transport Pr...
In this video, learn all about diffusion of gases. This will help you to understand how gases behave and also explain why smells spread. At Fuse School, teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. Our OER are available free of charge to anyone. Make sure to subscribe - we are going to create 3000 more! The Fuse School is currently running the Chemistry Journey project - a Chemistry Education project by The Fuse School sponsored by Fuse. These videos can be used in a flipped classroom model or as a revision aid. Find our other Chemistry videos here: https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV Be sure to follow our social media for the latest videos and information! Twitter: https...
◅ Donate: http://www.5minuteschool.com/donate ◅ Website: htttp://www.5minuteschool.com ◅ Twitter: http://www.twitter.com/5minuteschool ◅ Facebook: http://www.facebook.com/5minuteschool ◅ Email: contact@5minuteschool.com Welcome to Five Minute School, we aim to help you grasp the main concepts of your study in less than 5 minutes. In this video, we explain the important elements of Diffusion and Osmosis. Make sure you subscribe to our Channel and comment below if you have any questions. We will be uploading content across a variety of subjects, including Biology, Chemistry, Physics, Biochemistry and much more Thanks for watching
Learn all of the different ways to maximize the amount of particles that diffuse over a short distance over time. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Created by Rishi Desai. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-respiratory-system/rn-the-respiratory-system/v/oxygen-movement-from-...
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Diffusion und Osmose. Einführung in das Thema. Ein Lernvideo aus dem Bereich der Biologie, leicht verständlich und anschaulich erklärt. Dieses Video Tutorial basiert auf der Tutorial-Sammlung der Khan Academy (www.khanacademy.org) und wurde vollständig neu in Deutsch erstellt. Das Original-Video stammt von http://www.youtube.com/user/KhanAcademyDeutsch und wurde für die Wiederverwendung zugelassen. Diffusion (lat. diffundere ‚ausgießen', ‚verstreuen', ‚ausbreiten') ist ein natürlich ablaufender, physikalischer Prozess. Er führt mit der Zeit zur vollständigen Durchmischung zweier oder mehrerer Stoffe durch die gleichmäßige Verteilung der beteiligten Teilchen. Bei den Teilchen kann es sich um Atome, Moleküle oder Ladungsträger handeln. Bei den Stoffen handelt es sich meist um Gase und Flüs...
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