Fire as thermal conduction, convection, and radiation.
Why metal at room temperature feels cooler than wood at room temperature.
Intuition of how gases generate pressure in a container and why pressure x volume is proportional to the combined kinetic energy of the molecules in the volume. Created by Sal Khan.
To begin, Sal solves a constant temperature problem using PV=PV. Then he relates temperature to kinetic energy of a gas. In the second half of the video, he derives the ideal gas law. Created by Sal Khan.
Sal makes the case for the Kelvin scale of temperature and absolute zero by showing that temperature is proportional to kinetic energy. Then he explains that you need to use the Kelvin scale in the ideal gas law. To finish he does a sample ideal gas law problem. Created by Sal Khan.
Sal explains the concept of a mole. Then he derives the molar version of the ideal gas law PV=nRT, where the gas constant R=831 J/molK. Created by Sal Khan.
Sal uses the molar version of the ideal gas law to solve for the number of moles in a gas. He also shows how to convert this answer into number of molecules using Avogadro's number. Created by Sal Khan.
An overview of Third parties in the United States.
Thomas Hunt Morgan's pioneering fruit fly work that helped validate the chromosomal theory of inheritance.
Thomas Malthus's views on population. Malthusian limits. Created by Sal Khan.
Why when you get your money matters as much as how much money. Present and future value also discussed. Created by Sal Khan.
The Black Death ravages the Ilkhanate. Timur (Timurlane) establishes the Timurid Empire.
An introduction to title insurance. By Sal Khan.
Just because someone lives in a house doesn't always mean that they have the right to sell that house. Learn about the role of possession, titles, and deeds in the home buying process in this video.
When a demand curve is linear, calculating consumer surplus becomes relatively simple: calculate the area of a triangle. In this video we walk through calculating consumer surplus. Created by Sal Khan.
Critical incident angle and total internal reflection. Created by Sal Khan.
The short-run production function describes the relationship between output and inputs when at least one input is fixed, such as out output varies based on the amount of labor used. We can use this production function to find the total product of labor, the marginal product of labor, and the average product of labor.
One of the most practical applications of price elasticity of demand is its relationship to total revenue. A seller who knows the price elasticity of demand for their good can make better decisions about what happens if they raise or lower the price of their good. Explore the relationship between total revenue and elasticity in this video. Created by Sal Khan.
When governments impose restrictions on international trade, this affects the domestic price of the good and reduces total surplus. One such imposition is a tariff (a tax on imported or exported goods and services). See how a tariff impacts price, consumer surplus, producer surplus, tax revenue, and deadweight loss in this video.
Introduction to traditional IRA's (Individual Retirement Accounts). Created by Sal Khan.