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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Physics: More on entropy
Distinguishing between microstates and macro states. How entropy S is defined for a system and not for a specific microstate. Physics Learn…
VideoFree9 minutes
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Class 11 Physics (India) - Hindi: Relationship between angular velocity and speed (Hindi)
How angular velocity relates to speed. Class 11 Physics (India) - Hindi To help students who prefer to learn by watching Hindi videos, we'v…
VideoFree10
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Class 11 Physics (India) - Hindi: Change in centripetal acceleration from change in linear velocity and radius: Examples (Hindi)
Centripetal acceleration from linear and angular velocity. Class 11 Physics (India) - Hindi To help students who prefer to learn by watchin…
VideoFree5
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Chemistry: 2015 AP Chemistry free response 1e
Writing the electron configuration of zinc, and figuring out which electron is removed during oxidation. From 2015 AP Chemistry free respon…
VideoFree4 minutes
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Biology: The discovery of the double helix structure of DNA
How the double helix structure of DNA was discovered. Work of Watson, Crick, Franklin, Wilkins, and Chargaff. Biology Life is beautiful! Fr…
VideoFree9 minutes
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Chemistry: Molecular mass and molecular weight
Calculating the molecular mass and molecular weight of water. Chemistry Did you know that everything is made out of chemicals? Chemistry is…
VideoFree7 minutes
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Class 11 Physics (India) - Hindi: Race cars with constant speed around curve (Hindi)
When acceleration could involve a change in direction and not speed. Class 11 Physics (India) - Hindi To help students who prefer to learn …
VideoFree6
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Organic chemistry: Ring opening reactions of epoxides: Acid-catalyzed
How acid-catalyzed reactions can open the highly strained ring of an epoxide. Organic chemistry Sal and Jay cover topics covered in college…
VideoFree9 minutes
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Organic chemistry: Synthesis of alcohols using Grignard reagents I
Synthesis of primary, secondary, and tertiary alcohols from aldehydes and ketones using Grignard reagents. Organic chemistry Sal and Jay co…
VideoFree14 minutes
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Health and medicine: Pacinian's Corpuscle and Merkel's Disk
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Health and medicine: What is an aortic dissection?
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree14 minutes
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Health and medicine: Diabetic retinopathy
Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…
VideoFree13 minutes
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Chemistry: VSEPR for 5 electron clouds
VSEPR for molecules with five electron clouds including examples for trigonal bipyramidal and seesaw-shaped molecules. Chemistry Did you kn…
VideoFree15 minutes
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Health and medicine: Sensory adaptation
Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…
VideoFree7 minutes
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Chemistry: Introduction to reaction quotient Qc
Introduction to the reaction quotient Qc, and comparing the reaction quotient with the equilibrium constant to predict how concentrations w…
VideoFree8 minutes