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With integrals, it can be helpful to introduce the notion of "negative area". See why! Class 11 Physics (India) Let's learn, practice, and …

Find out why you can make music by blowing into empty bottles. Class 11 Physics (India) - Hindi To help students who prefer to learn by wat…

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

Sal explains how to draw free body diagrams when forces are applied at an angle. How to find horizontal and vertical components of an angle…

Why does ice float on water? You may already know that ice is less dense than water, but why? Usually, solids are denser than liquids. In t…

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

Half-wave rectifiers only keep the circuit on for half the time. To get more output we need a full wave rectifier In this video, let's see …

Find out how tonicity is determined by ions that don't move across membranes and how it affects the movement of water. Rishi is a pediatric…

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

An atrial septal defect is a hole between the two atriums of the heart. Normally this hole is present at birth but closes within a few days…

Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-p…

Harmonic motion refers to the motion an oscillating mass experiences when the restoring force is proportional to the ​displacement, but in …

When we add impurities to semiconductors, what happens to minority charge carriers? Do they remain the same? In this video, we will explore…

Finding the relationship between standard cell potential and equilibrium constant K. Chemistry Did you know that everything is made out of …

Molarity and osmolarity may sound similar, but they are two distinct concepts. Molarity (M) is the number of moles of solute per liter of s…