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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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Organic chemistry: E2 mechanism: regioselectivity

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Regioselectivity of E2 elimination reactions. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic…

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Class 11 Physics (India): Worked example: matching an input to a function's output (equation)

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Sal finds the input value for which f(t)=13, given that f(t)=-2t+5. Class 11 Physics (India) Let's learn, practice, and master topics of cl…

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Health and medicine: Contractility, Ea, and preload effects on PV boxes

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See how contractility, Ea (arterial elastance), and preload each have an effect on PV Boxes. Rishi is a pediatric infectious disease physic…

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Class 11 Physics (India): Analyzing scalar multiplication

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Sal analyzes the magnitude and direction of vectors that are a result of scalar multiplication of a vector whose magnitude is given. Class …

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Chemistry: Solubility and the pH of the solution

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Using le Chatelier's principle to see what happens to the solubility of calcium fluoride when pH is decreased. Also looks at effect of pH o…

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Health and medicine: Peripheral chemoreceptors

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Peripheral chemoreceptors are extensions of the peripheral nervous system that respond to changes in blood molecule concentrations (such as…

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Organic chemistry: Intro to organic mechanisms

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Identifying electrophiles and nucleophiles. Showing movement of electrons using curved arrows. Organic chemistry Sal and Jay cover topics c…

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Class 11 Physics (India): Particular solutions to differential equations: rational function

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Sal finds f(-1) given that f'(x)=24/x³ and f(2)=12. Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics (…

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Health and medicine: Three components of emotion and the universal emotions

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Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

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Health and medicine: Intelligence

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Learn about different definitions of intelligence and the nature/nurture debate in the context of intelligence. Health and medicine The med…

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Class 11 Physics (India): Introduction to gravity

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Basics of gravity and the Law of Universal Gravitation Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physic…

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Class 12 Physics (India): Absorption and emission

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Using shell model diagram to relate absorption to emission. Derives relationship between emitted photon and energy levels, the Balmer-Rydbe…

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Health and medicine: Pulmonary hypertension treatment

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Health and medicine The medical world can be a confusing place. Patients, their families, and even students entering health fields might fe…

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Class 11 Physics (India) - Hindi: Area expansion coefficient (Hindi)

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Commonly on heating things expand and their area changes. Let's find out how to quantify this. Class 11 Physics (India) - Hindi To help stu…

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Electrical engineering: Attach the LED eyes

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Electrical engineering Learn about electricity, circuit theory, and introductory electronics. We also have sections that let you get down a…