Khan Academy: 2757 products
Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …
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Health and medicine: Oxygen movement from alveoli to capillaries
Watch as a molecule of oxygen makes its way from the alveoli (gas layer) through various liquid layers in order to end up in the blood. Ris…
VideoFree12 minutes
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Health and medicine: Heart attack (myocardial infarction) pathophysiology
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree12 minutes
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Health and medicine: Fetal circulation right before birth
Watch how the blood flows through the fetal circulation and compare it to what happens in the baby's body. Rishi is a pediatric infectious …
VideoFree12 minutes
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Health and medicine: What is a pleural effusion?
Pleural effusions are when excess fluid get caught between two layers of tissue (the visceral and parietal pleurae) surrounding the lungs. …
VideoFree6 minutes
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Health and medicine: What is iron deficiency?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree13 minutes
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Health and medicine: Depolarization waves flowing through the heart
Get a clearer idea of what a "Depolarization Wave" means and how it goes from cell to cell through the entire heart! Rishi is a pediatric i…
VideoFree12 minutes
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Class 11 Physics (India): Relationship between exponentials & logarithms
Sal rewrites 100=10^2 as a logarithmic equation and log_5(1/125)=-3 as an exponential equation. Class 11 Physics (India) Let's learn, pract…
VideoFree2
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Physics: Optimal angle for a projectile part 3: Horizontal distance as a function of angle (and speed)
In this video, we'll finish writing the formula for distance as a function of the angle Physics Learn about the basic principles that gover…
VideoFree3 minutes
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Physics: Starting to set up a Newtonian path–time diagram
We introduce a graph that's a lot like your good old position-vs-time graph—but with a twist! Physics Learn about the basic principles that…
VideoFree8 minutes
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Health and medicine: Aldosterone raises blood pressure and lowers potassium
See how Aldosterone effects the principal cells of the kidney to raise BP and lower potassium. Rishi is a pediatric infectious disease phys…
VideoFree13 minutes
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Health and medicine: Thinking about heartbeats
Find out what happens when things move very slowly through the AV Node! Rishi is a pediatric infectious disease physician and works at Khan…
VideoFree10 minutes
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Health and medicine: Torsades de pointes
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree10 minutes
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Class 11 Physics (India): Worked example: motion problems (with definite integrals)
What can you say about the velocity and position of a particle given its acceleration. Class 11 Physics (India) Let's learn, practice, and …
VideoFree9
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Physics: Compass build (stroke direction)
Does the direction which we stroke the needle determine the final orientation? Physics Learn about the basic principles that govern the phy…
VideoFree1 minute
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Physics: Question 3a: 2015 AP Physics 1 free response
Graphing energy versus position for a block accelerated by a spring and stopped by friction. Physics Learn about the basic principles that …
VideoFree8 minutes