Fusion Power Explained – Future or Failure

The fundamental currency of our universe is energy. It lights our homes, grows our food, powers our computers. We can get it lots of ways: Burning fossil fuels, splitting atoms, or sunlight striking photovoltaics. But there’s a downside to everything Fossil fuels are extremely toxic, Nuclear waste is… well, nuclear waste, And, there are not […]

Electric Charge and Electric Fields

Professor Dave again, let’s discuss electric fields. We live in an age where we take electricity for granted. Just plug into the wall and you can power any device you want. But what’s in there? What is electricity made of? The discovery of a variety of phenomena over several centuries eventually led to our mastery […]

The Map of Physics

So physics is a huge subject that covers many different topics going from galaxies in the depths of space right down to subatomic particles. And if you don’t already know physics its difficult sometimes to see how all these different subjects are related to each other. So this is my attempt to show that in […]

Radius of a Metal Atom and Metal Density

In this screencast we’re going to determine the radius of a lead atom and the density of lead. So the first question we have to ask is what kind of unit cell is lead? And if we look at this picture on the left lead is face centered cubic. In other words, it has atoms […]

The science of static electricity – Anuradha Bhagwat

It can strike without warning, at any moment. You may be walking across a soft carpet and reaching for the door knob when suddenly…zap! To understand static electricity, we first need to know a bit about the nature of matter. All matter is made up of atoms that consist of three types of smaller particles: […]

Top 5 strongest metals

5. Osmium. Osmium is a bluish white colour. Its melting point is 3030 degrees C. It was discovered in 1803. Osmium is producing very hard alloys that used in fountain pen tips, needles and electrical contacts. 10 % osmium and 90% platinum uses in surgical implants like pacemakers and replacement heart valves. You can also […]

Chemistry: What is a metal? (Metallic Bonds)

Metals are shiny, malleable, ductile, and good conductors of heat and electricity. The structure of metals and the nature of metallic bonds explains some of these typical features. Metals are made up of positive ions closely packed together in crystalline solids. The positive ions are surrounded by a mobile “sea of electrons.” These valence electrons […]