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Diffusion
The spread of particles from an area of high concentration to an area of low concentration. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science...
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Hydrocarbons
Any organic compound composed only of carbon and hydrogen. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce...
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Factpack: DNA
How DNA dictates the genetic traits of humans and all organisms. Biology - Cells And DNA - Learning Points. A Twig FactPack Film. Open a discussion on what has been already learnt in a topic, or use to grab attention at the start of a...
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Active transport
The use of energy to move particles across a cell membrane from a lower concentration to a higher concentration. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Evaporation
The vaporisation of a liquid that takes place at its surface, as molecules with more energy change from a liquid to gas. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise...
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Crystal
A solid consisting of atoms, molecules, or ions arranged in a highly ordered, repetitive, three-dimensional lattice. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Brownian motion
The random movement of small, visible particles suspended in a liquid or gas, when viewed under a microscope. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Compound
A substance composed of more than one chemical element, whose atoms are held together by strong chemical bonds and are combined in a fixed ratio. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using...
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Chemical bond
Bonds between atoms that allow the formation of chemical compounds. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
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Vacuole
A fluid-filled compartment inside a cell, surrounded by a membrane. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films...
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Viscosity
The measure of a liquid's resistance to flow. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract concepts...
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Lipids
Organic molecules that contain long carbon chains or rings and which tend to be insoluble in water, though soluble in organic solvents. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images...
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Surface tension
The cohesive force that occurs at the surface of a liquid, due to the attractive forces between molecules. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual...
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Heat
The transfer of thermal energy. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig Science Glossary Films reinforce abstract concepts and key...
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Expansion and Contraction
Discover how different materials react to heat, and why this can be both useful and dangerous. Physics - Energy And Radioactivity - Learning Points. Temperature affects the size and shape of an object due to the expansion and contraction...
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Why is the Sky Blue? - Sky Color Explained
The atmospheric composition of the sky affects the colours we see. From blue horizons to red sunsets, why do we see colours the way we do? Physics - Our Solar System - Learning Points. Light is made up of different wavelengths. Our...
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Gas Laws
The air we breathe is made up of a mixture of gases. Discover the invisible forces of gas at work around us. Physics - Forces - Learning Points. The air we breathe is made up of gases including nitrogen, oxygen and carbon dioxide. The...
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The Elements: Iron
Iron is crucial in many areas of life: it is found in our blood, as well as being used to build bridges. Chemistry - Periodic Table - Learning Points. Iron is one of the most common element on Earth. Iron is found in living organisms....
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Why is Blood Red?
What is it in our blood that makes it red, and why are other animals different? Biology - Human Body - Learning Points. Haemoglobin is the most efficient oxygen carrier and provides the red pigment in blood. Not all animals have red...
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Oxygen and Combustion
Combustion reactions are vital: from keeping us warm and cooking our food, to providing electricity and propelling rockets into outer space. What do we know about these chemical reactions? Chemistry - Reactions - Learning Points....
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Changing States of Matter
Water can either be a solid, a liquid or a gas. How does matter change state? Chemistry - Atoms And Bonding - Learning Points. Ice, liquid water and steam all consist of exactly the same molecules. Evaporation occurs when the temperature...
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Intermolecular Forces
Discover the role played by intermolecular forces in changing the state of matter between solid, liquid and gas. Chemistry - Atoms And Bonding - Learning Points. Intermolecular forces are the attractive forces between molecules....
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What is Light? - Light Energy
We can see our surroundings because of light energy. Whether light waves are being emitting from a source or being reflected, this form of energy is vital to life on Earth. Physics - Waves - Learning Points. Light is an energy that...
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Mars: Dead Planet
Scientists hoped the first mission to Mars would reveal life on the red planet. What did the mission find? Physics - Universe - Learning Points. Percival Lowell believed there were canals and cities on Mars. In 1965, NASA probe Mariner 4...