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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Class 11 Physics (India): Calculating average velocity or speed
Although speed and velocity are often words used interchangeably, in physics, they are distinct concepts. Speed is calculated by dividing t…
VideoFree12 minutes
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Health and medicine: Alveolar gas equation - part 1
Find out how to calculate exactly how much oxygen is deep down inside your lungs! Rishi is a pediatric infectious disease physician and wor…
VideoFree8 minutes
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Organic chemistry: Keto-enol tautomerization (by Sal)
Keto-enol tautomerization. Organic chemistry Sal and Jay cover topics covered in college organic chemistry course. Basic understanding of b…
VideoFree8 minutes
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Class 10 Physics (India): Myopia & Hypermetropia
Let's explore the common defects in the eye, myopia (shortsightedness) and hypermetropia (farsightedness), using ray diagrams. Class 10 Phy…
VideoFree10
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Class 11 Physics (India) - Hindi: Centripetal force problem solving (Hindi)
In this video, Ram gives some problem-solving strategies for centripetal force problems and explains many common misconceptions people have…
VideoFree17
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Class 11 Physics (India): Instantaneous speed and velocity
Instantaneous speed and velocity looks at really small displacements over really small periods of time Class 11 Physics (India) Let's learn…
VideoFree5 minutes
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Class 11 Physics (India): Doppler effect for a moving observer
What happens when just the observer is moving? Class 11 Physics (India) Let's learn, practice, and master topics of class 11 physics (NCERT…
VideoFree5 minutes
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Class 11 Physics (India) - Hindi: Thermal stress (Hindi)
When you pour very hot water into a glass then it might shatter sometime. This thermal shock results from thermal stress generated due to r…
VideoFree10
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Class 11 Physics (India) - Hindi: Angular velocity and speed (Hindi)
An intuition for the relationship between the formulas for angular velocity and speed, including a worked example of calculating angular ve…
VideoFree6
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Class 12 Physics (India): De Broglie wavelength
In this video, David explains how Louis De Broglie got his Nobel Prize for the idea of matter having a wavelength. Class 12 Physics (India)…
VideoFree11 minutes
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Health and medicine: TB and HIV
Two deadly diseases, HIV and TB, can often co-exist in the same patient. These videos do not provide medical advice and are for information…
VideoFree9 minutes
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Chemistry: Balancing another combustion reaction
Balancing the combustion reaction of ethane, C₂H₆ Chemistry Did you know that everything is made out of chemicals? Chemistry is the study o…
VideoFree5 minutes
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Electrical engineering: What is inside an alarm clock radio?
In this video we explore what is inside an alarm clock, how it is made, and how it works. Electrical engineering Learn about electricity, c…
VideoFree14 minutes
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Chemistry: Concentration cell
Concentration cells are galvanic (or voltaic) cells made of two half-cells, each of which containing the same electrodes, but different con…
VideoFree10 minutes
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Class 11 Physics (India): Basic derivative rules: find the error
Sal analyzes two attempts of students to differentiate linear functions. Class 11 Physics (India) Let's learn, practice, and master topics …
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