Liacos Educational Media
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InEpisode 1 of the Shedding Light on Acids and Bases series, Acids in Industry, we look at what acids are, how they’re made, and how they’re used in steel making and agriculture. We also take a quick trip back to the 1770s to look at how acids were used by Captain James Cook to save his crew from the disease that used to kill more sailors than shipwrecks and sea battles!
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In Episode 4 of the Shedding Light on Acids and Bases series, pH, we take an in-depth look at H+ and OH– ions and we explain how the pH scale is used to express how strongly acidic or how strongly basic a particular environment is. We examine how the pH of natural environments affects plant and animal life and how the human body has to carefully control the pH of our organs.
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In this program on temperature, we get down to the atomic level to explain how hot things are different to cold things. We describe what a temperature scale actually tells us, and demonstrate how scientists measure the amount of heat energy that water absorbs when it’s heated.
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In this episode, we describe how tropical cyclones form and examine their huge power. We explain what the Coriolis Effect is and how it makes tropical cyclones rotate the way that they do. We also travel to three continents to demonstrate how the Coriolis Effect affects water draining from a small container. Does water really swirl in a different direction depending on which hemisphere it’s in?
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In Episode 5 of the Shedding Light on Acids and Bases series, Advanced Acid-Base Chemistry, we take a deeper look at pH and explain how the numbers on the pH scale are actually related to the number of H+ or OH- ions present in an acid or a base. We then descend even deeper down—to the atomic level—to explain what actually happens when acids react with bases and what actually happens when acids react with metals. We introduce students to ionic...
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In episode eight of the Shedding Light on Motion series, we look at that most poetic of all Laws. For every action there is an equal and opposite reaction. How does a rocket engine work? Why do guns recoil when fired? How do our muscles work? What propels us when we’re swimming? And how exactly is gravity a two-way interaction? All these questions, and many more, are answered in this excellent video.
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In this program, we look at the three ways that heat energy can transfer from one thing to another: conduction; convection; and radiation. A heat source is useless if heat energy can’t transfer from the heat source to whatever you want heated. Understanding heat transfer is essential if you want to cook good food and if you want to stay warm when it’s cold and stay cool when it’s hot.
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In Episode 3 of the Shedding Light on Acids and Bases series, Neutralization, we explain what bases are and then take a look at what happens when acids and bases chemically react. We also take a look at acid-base indicators, which are chemicals that change colour depending on whether they are in an acid or a base.
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Nuclear radiation can be incredibly dangerous, but it can also be incredibly useful to us. The "Shedding Light on Nuclear Radiation" series teaches students what nuclear radiation is and how humans have harnessed its awesome power."Episode 6: Radiocarbon Dating" looks at how scientists use the presence of radioactive carbon-14 atoms in nature to determine the age of ancient artifacts. This dating technique is called radiocarbon dating. The program...
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In this program, we introduce students to the concept of efficiency, which is a measure of how much useful energy you get out of something compared to the amount of energy that you put into it. We answer a bunch of questions including: How much light energy do we get out of light globes compared to the amount of electrical energy that goes into them? Hint: it’s not much; they should be called heat globes! How much kinetic energy do we get out of...
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In episode six of the Shedding Light on Motion series, presenter Spiro Liacos is “thrown forward” in a head-on collision, “thrown backwards” when his tram takes off, and “thrown to the side” when his car suddenly turns a corner. But in fact none of these things actually happen! Using brilliant visuals, this episode looks at the fact that an object will remain stationary or move with a constant velocity unless a force acts on it. It also...
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In this program, we introduce the “joule”, the unit for energy. We then look at how much energy is stored in different foods by comparing apples and oranges (normally a no-no) and we discuss how much energy we need to do certain things including nothing much at all. We then explore the concept of energy balance and reveal the two simple rules for weight loss. That’s right, there are only two!
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In Shedding Light on Nuclear Radiation Episode 4: Beta-Plus Decay, we introduce students to beta-plus particles, also known as positrons. Beta-plus particles are a form of anti-matter. Though beta-plus particles don’t really exist in huge quantities naturally on Earth, scientists have learned how to actually make atoms that emit them! Beta-plus particles have now become a major tool for doctors to diagnose a wide variety of cancers.