Khan Academy
Why Gravity Gets So Strong Near Dense Objects, Cosmology and Astronomy
Sal uses Newtonian physics to explain the relationship between gravity and dense objects. He uses diagrams and relatively straightforward mathematics to demonstrate this concept.
Khan Academy
Cyclic Ethers and Epoxide Naming, Organic Chemistry
An informative video focuses on the categories of ethers, specifically defining the cyclic subset of ethers. Sal examines epoxides and explains why they are significantly more reactive than the generally stable ethers.
Khan Academy
Aldehyde Introduction, Aldehydes and Ketones, Organic Chemistry
Sal clarifies a description that he missed in prior videos about the strong smell of amines. He then recaps and compares many of the small and large aldehydes, taking the opportunity to describe their structure and the progression of...
Khan Academy
Parsec Definition, Stars, Black Holes and Galaxies, Cosmology and Astronomy
What is a parsec? Sal's video explains that a parsec is 3.26 light years and that the word itself can be broken down into "par" (meaning parallax) and "sec" (meaning one arc second). He uses illustrations, diagrams, and trigonometric...
Khan Academy
Parallax in Observing Stars, Cosmology and Astronomy
Parallax is the apparent change of an object determined by the line of sight. Sal defines the concept of parallax and applies it to how we determine the relative distance between us and nearby stars. He draws a diagram to illustrate what...
Khan Academy
A Universe Smaller than the Observable
The universe is much larger than we can imagine, and in many ways, much smaller than we can see. Sal explains how the universe itself may be smaller than the observable universe based on the theory of Cosmic Inflation. The video covers...
Khan Academy
Why Cepheids Pulsate, Stars, Black Holes and Galaxies, Cosmology and Astronomy
Classical Cepheids are supermassive stars that are used to determine distances to galaxies within a local group. Sal explains why Cepheid variables occur, how they are used to determine distances, and the chemistry that creates the...
Khan Academy
Lifecycle of Massive Stars, Stars, Black Holes and Galaxies, Cosmology & Astronomy
A massive star has a mass greater than nine times that of our sun. Sal focuses on the fusion and chemical reactions that take place during the lifecycle of a massive star. He clearly explains the gravitational pull to the chemical...
Khan Academy
Cosmological Time Scale 2, Scale of the Universe, Cosmology and Astronomy
Sal compares the distance of significant objects and the timeline of events in the universe on a scaled timeline across the screen.
Khan Academy
First Living Things on Land Clarification, Cosmology and Astronomy
Sal clarifies concepts covered in the Khan Academy video on Biodiversity in the Phanerozoic Eon. He explains the types of animals and plants that were the first life forms on land. Additionally, he describes what these organisms would...
Khan Academy
Why S-Waves Only Travel in Solids, Cosmology and Astronomy
Starting with a clear diagram to demonstrate how a wave actually forms, an informative video will provide a great summary of s-wave travel. It explains the difference between polar bonds in liquids and the stronger ionic and covalent bonds.
Khan Academy
Hubble Image of Galaxies, Scale of the Universe, Cosmology and Astronomy
Sal gives an example of where the Hubble telescope looks, as well as the level of detail that the camera can see.
Khan Academy
Galactic Collisions, Stars, Black Holes and Galaxies, Cosmology and Astronomy
An interesting video addresses the concept of galactic collisions. He narrates the animated video explaining what is happening and how collisions merge into a new galaxy. Note: While the computations are concrete, the video is theoretical.
Khan Academy
Radius of Observable Universe, Scale of the Universe, Cosmology and Astronomy
The concept of the universe can be incredibly complex on both physical and mathematical levels. Yet Salman Khan can explain concepts that lead to conclusions about the universe's size. He uses intriguing diagrams and presents information...
Khan Academy
MTEL Math Practice Test: 31-35
Applying algebra and geometry skills, a set of problems tests the viewer with questions about area, radius, and proportions. An excellent review for even the most confident future math teacher, the video is sure to help with the correct...
Khan Academy
Scale of Solar System, Scale of the Universe, Cosmology and Astronomy
After the previous video in this series, class members should have a general grasp of the relative sizes of the Earth and the Sun. This video provides further information about the distances between the planets and offers a sense of...
Khan Academy
Stellar Distance Using Parallax, Cosmology and Astronomy
As a follow-up to the Khan Academy video on parallax, this video focuses on parallax as it relates to astronomical distance. Sal uses cardinal directions and the seasons to help students orient themselves in the proverbial night sky....
Khan Academy
Ether Naming and Introduction, Organic Chemistry
Beyond using ethers as an example of an aprotic solvent (as in most of the previous videos), Sal describes the molecule diethyl ether with its IUPAC name and provides more detail about its properties. This video assumes your class will...
Khan Academy
Angles (Part 3), Angles and Intersecting Lines, Geometry
As preparation for the angle game, a geometry video covers the concepts of parallel lines, transversals, slope, opposite angles,, and corresponding angles. It is the third part of a series detailing the rules and laws regarding angles.
Khan Academy
Scale of Distance to Closest Stars, Scale of the Universe, Cosmology and Astronomy
The third video in a series based on the scale of the universe, this lecture uses great images to help expand on the idea of scale. By comparing the distance to the closest star to the progress of Voyager 1 and 2, the narrator gives the...
Khan Academy
Chinese Inflation, Money, Banking and Central Banks, Finance and Capital Markets
After examining the rapid increase in China's money supply, Sal provides a simple breakdown of how this may be impacting domestic price inflation in China. He reads through an article excerpt that asserts the reported inflation rate is...
Khan Academy
China Pegs to Dollar to Keep Trade Imbalance
Continuing from the previous video, Sal reviews the China-US trade relationships and the floating currency scenario that should leave the dollar weaker and the Yuan stronger. He explains why the People's Bank of China doesn't want this...
Khan Academy
Interest (Part 2), Interest and Debt, Finance and Capital Markets
Another example of simple interest and compound interest (compounded yearly) is explored in this video.
Khan Academy
Economics of a Cupcake Factory, Inflation, Finance and Capital Markets
Sal is starting a cupcake factory and walks learners through the cost and profit calculations necessary for any new business. He uses simple numbers for the start-up costs, overhead, product price, and cost per cupcake. Sal writes out...