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Browse results: The Atomic Basis of the Properties of Matter

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Atomic Structure of an Alloy Learn about the atomic structure of bronze, a copper alloy, in this video excerpt from NOVA: "Hunting the Elements." Accessibility features: Caption, Transcript	6-12	Video
Bend, Twist and Break: Beyond the Laboratory Dr. Chris Muhlstein explains that when scientists study fracture surfaces from controlled experiments to understand the resulting shapes and features, they can use their understanding to deduce what happened when they were not around to see the material fail or break. Further they can predict what will have to a larger or smaller piece of material under stress. This process is how scientists and engineers translate a lab experiment into a design for an airplane, bridge or even a bike frame. Accessibility features: Caption	6-12	Video
Bend, Twist and Break: Breaking Glass Dr. Chris Muhlstein explains that researchers learn about the scientific basis for failure of materials by running experiments in the lab, using a simple shape like a glass rod to calculate the strength of material and predict its failure. The same tests can be done at the micro and nano scale using tiny specimens. Students can run a similar experiment with a bar of chocolate. Accessibility features: Caption	6-12	Video
Bend, Twist and Break: Fracture Surfaces Dr. Chris Muhlstein explains that fracture surfaces can reveal how and why a material has failed. An image of a fracture surface has features or shapes that we can use to understand where a material failed and why. Scientists use an optical microscope or a scanning electron microscope to read a fracture surface at high magnifications, much like we read maps to find our way. Accessibility features: Caption	6-12	Video
Bend, Twist and Break: The Bridge Dr. Chris Muhlstein explains that the arrangement of atoms in a material determines the properties. He drops an iPod to illustrate how the arrangement of atoms can protect it from damage; he narrates footage of the collapse of the Tacoma Narrows Bridge in the 1940s to show how the deformation of materials can cause the collapse of a structure. Accessibility features: Caption	6-12	Video
Everyday Radiation How much radiation are we exposed to every day? Find out in this video segment adapted from FRONTLINE. Accessibility features: Caption	6-12	Video
Fusion: Testing the First Hydrogen Device This video segment adapted from AMERICAN EXPERIENCE features original footage of the U.S. test of the first hydrogen device, code-named "Mike", that would trigger thermonuclear fusion. Accessibility features: Caption	6-12	Video
Fusion: The Hydrogen Bomb Just after World War II, nuclear scientists turned their attention from fission to fusion. This video segment adapted from AMERICAN EXPERIENCE looks at the beginnings of thermonuclear power generation. Accessibility features: Caption	6-12	Video
Global Warming and The Greenhouse Effect This video excerpt from Race to Save the Planet discusses the greenhouse effect and global warming. Accessibility features: Caption	6-12	Video
The Impact of Technology: Nylon This video segment adapted from A Science Odyssey looks at the invention of nylon. Accessibility features: Caption	6-12	Video
Island of Stability In this video segment adapted from NOVA scienceNOW, follow scientists in their quest to understand how stable elements are made and how to create the elusive element 114. Accessibility features: Caption	9-12	Video
Making Cortisone From Plants This video segment adapted from NOVA is a dramatized story of chemist Percy Julian’s work to synthesize cortisone. Find out how a biological process, not a chemical one, proved the key to producing cortisone in bulk. Accessibility features: Caption	6-12	Video
Melissa Franklin: High Energy Physics This video segment adapted from Discovering Women profiles Fermilab physicist and Harvard professor Melissa Franklin. Accessibility features: Caption	9-12	Video
Nanotechnology Learn about the fundamentals of nanotechnology and its applications, in this video segment adapted from Pennsylvania College of Technology and WVIA. Accessibility features: Caption	9-12	Video
A Nanotube Space Elevator In this video adapted from NOVA scienceNOW, find out about the discovery of a new building material, the carbon nanotube, whose physical properties could theoretically enable the creation of a 22,000-mile elevator to space. Accessibility features: Caption	6-12	Video
Nuclear Reaction: Fission This video segment adapted from FRONTLINE looks at nuclear fission as an energy source that can be used to generate electricity. Accessibility features: Caption	6-12	Video
Nuclear Reaction: Meltdown What happens when a nuclear reactor overheats? This video segment adapted from FRONTLINE looks at the nuclear reactor meltdown at Chernobyl, the worst accident of its kind. Accessibility features: Caption	6-12	Video
Nuclear Reaction: Plutonium One by-product of nuclear fission is plutonium. This video segment adapted from FRONTLINE takes a look at this toxic element. Accessibility features: Caption	6-12	Video
Nuclear Reaction: Three Mile Island This video segment adapted from AMERICAN EXPERIENCE examines the worst nuclear accident in U.S. history. Accessibility features: Caption	6-12	Video
Nuclear Waste: Yucca Mountain What happens to nuclear waste? This video segment adapted from FRONTLINE explores the controversy surrounding the United States' first nuclear repository site. Accessibility features: Caption	6-12	Video
Quarks: Inside the Atom This video segment adapted from NOVA shows how the particle accelerator helped physicists find parts of the atom even smaller than protons and neutrons. Accessibility features: Caption	6-12	Video
Radiometric Dating In this video segment from A Science Odyssey, scientists explain how Earth's age was determined by examining the radioactive rocks in Earth's crust. Accessibility features: Caption	6-12	Video
Radon Radiation The biggest source of environmental radiation might be in your home. Find out more in this video segment adapted from FRONTLINE. Accessibility features: Caption	6-12	Video
Smart Bridges In this video segment adapted from NOVA scienceNOW, learn about engineering innovations that could help detect a bridge's structural weaknesses before they become dangerous. Accessibility features: Caption	6-12	Video
String Theory: Gravity - The Odd Man Out This video segment from NOVA describes the discovery in the 1930s of two forces in addition to electromagnetism: the strong nuclear force and the weak nuclear force. Accessibility features: Caption	9-12	Video
Synthesizing an Alkaloid In this video segment, adapted from NOVA, learn how chemist Percy Julian revolutionized chemistry by synthesizing the alkaloid physostigmine from scratch—the first total synthesis of a chemical compound. Accessibility features: Caption	9-12	Video
Synthesizing a Steroid This video segment, adapted from NOVA, tells the story of chemist Percy Julian's quest to make progesterone from a plant steroid, an important medical advancement of the 1940s. Accessibility features: Caption	9-12	Video
What Holds a Molecule Together? This video/animation illustrates that a molecule is a small group of atoms that is stuck or bonded together with electrons. Dr. Chris Muhlstein introduces the idea of three primary types of bonds: ionic, covalent and metallic; animations show how they form at the atomic level, and give everyday examples Accessibility features: Caption	9-12	Video
What is a Molecule? This video/animation shows that a molecule of water is made up of oxygen and hydrogen atoms. When oxygen and hydrogen atoms exist alone, their properties are different from the properties they have when they are chemically combined to form a water molecule Accessibility features: Caption	6-12	Video