4. Chemistry and Physics

Transcript: One of the most important principles in physics is the law of conservation of energy. Energy can be neither... Read more

Transcript: Almost all energy on Earth has its origin with the sun. Think about the chain of events that makes it possi... Read more

Transcript: There are many situations in physics and astronomy where there is a mixture of gravitational potential energ... Read more

Transcript: Kinetic energy is the energy of motion. It depends on both mass and velocity and is defined mathematically ... Read more

Transcript: Light is a form of electromagnetic energy, but it is just one example of a wide array of forms of electromag... Read more

Transcript: Very few books ever changed the world, but in 1543 Copernicus published such a book called On the Revolution... Read more

Transcript: Chemical energy is a form of potential energy stored in the bonds between atoms and molecules. Chemical ene... Read more

Transcript: There are several broad types of energy. Energy is measured in units of calories in the English system or jo... Read more

Transcript: When you knock on a wall or a piece of metal it feels solid enough. But normal matter is actually fantastic... Read more

Transcript: Atoms are tiny pieces of matter, but they are composed of even smaller particles. Orbiting the nucleus of e... Read more

Transcript: A radioactive element or atom is something that spontaneously decays, often into a more stable form, by the ... Read more

Transcript: The chemical properties of an element are defined by its atomic number, or the number of protons. In normal... Read more

Transcript: Each element is defined by a unique atomic number which is the number of protons and electrons in an atom of... Read more

Transcript: The man who did a decisive set of experiments in the early 20th century to demonstrate the atomic structure ... Read more

Transcript: In the early 1800s only 30 elements were known, insufficient to see any pattern in their behavior. Around t... Read more

Transcript: The atomic theory is the basis of modern chemistry. Dalton published his work in 1810. There are a few key... Read more

Transcript: Dalton came up with the idea of atoms as the ultimate particle. That is, an atom is a particle of each elem... Read more

Transcript: Dalton reached his theory of atoms by experimenting with gasses using entirely homemade equipment. For exam... Read more

Transcript: The person who gets credit for developing the first theory of atoms was a self educated man called John Dalt... Read more

Transcript: Space exploration is expensive, and space travel using humans is even more expensive. The high cost almost ... Read more