Curated Video
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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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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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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Fractional Distillation - Crude Oil Separation
Learn how the industrial process of fractional distillation transforms crude oil into a variety of products, from plane fuel to road surfacing. Chemistry - Chemical Industries - Learning Points. Extraction of crude oil from Fractional...
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Solids, Liquids and Gases
What is the difference between solids, liquids and gases? How does each state behave? Chemistry - Atoms And Bonding - Learning Points. The kinetic theory of matter states that particles are in constant motion and there are forces of...
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Acids and Alkalis: Part 1
The properties of strong acids and alkalis can be extremely harmful. Where do we find them, and how can we tell how acidic or alkaline a substance is? Chemistry - Reactions - Learning Points. Bases neutralise acids, and if a base...
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Heat Transport
Conduction, convection and radiation are all ways in which heat is transported. How does each work, and what are they useful for? Physics - Energy And Radioactivity - Learning Points. The three types of heat transport are conduction,...
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Speed of Sound
Sound waves move through different mediums at different speeds, but why is this? What factors affect the speed of sound? Physics - Waves - Learning Points. Speed of sound depends on many different factors. Temperature, elasticity and...
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What is Sound?
Sounds can vary greatly: extremely quiet or deafeningly loud, high and shrill to low and booming. Why are they so different? Physics - Waves - Learning Points. Sound is a vibration passed to and fro along particles forming a wave. It can...
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Liquid Density
We compare the density of oil, salt water and fresh water using displacement tanks. Equally weighted measuring cylinders are placed into the three liquids and the amount of water displaced is collected for comparison. Physics - Forces -...
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Non-Newtonian Liquids
Introducing the liquids whose behaviours seem to defy the accepted states of matter. What are they and why don't they behave as we predict? Chemistry - Atoms And Bonding - Learning Points. Newtonian liquids take the shape of their...
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Liquids – Jigsaw
What is it? ... These are tubes of paint! Material processes - Solids, liquids and gases - Liquids A Twig Tidbit Film - Jigsaw. An image is slowly revealed as pieces of the jigsaw are removed. The children have to identify it.
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What is everything made of?
Everything is made of the same thing – tiny building blocks called atoms. The world around us - Exploring materials - What is everything made of? Learning Points Everything is made of atoms. Atoms are very small, so they can’t be seen by...
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Supermarket solids and liquids
Take a trip to the supermarket to see the differences between solids and liquids. The world around us - Exploring materials - What is everything made of? Learning Points Things can be identified as solids or liquids. Solids keep their...
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Solids – True or false
True or false ... Only liquids can be poured? Material processes - Solids, liquids and gases - Solids Learning Points Some solids, such as sand, can be "poured" because of gaps between particles. A Twig Tidbit Film - True or False? The...
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Liquids – What's that noise?
What's that noise? ... It's a waterfall! Material processes - Solids, liquids and gases - Liquids A Twig Tidbit Film - What’s that noise? The children have to identify an object from its sound alone.
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What is a mixture?
Find out what makes a mixture, and what happens when materials react chemically. Material processes - Separating mixtures - What is a mixture? Learning Points A mixture is formed when different materials are combined without chemical...
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Why is the Statue of Liberty green?
Did you know that the Statue of Liberty hasn't always been green? Material processes - Changing materials - Chemical reactions Learning Points Chemical reactions produce new substances. Chemical changes always involve two or more...
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What is a solid?
What properties do solids, liquids and gases have? Material processes - Solids, liquids and gases - Solids Learning Points Solids have a fixed shape that can only be changed by external force. Solids have a fixed volume. The molecules in...
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Advanced separation
Find out how advanced separation processes are used to separate substances in complex mixtures. Material processes - Separating mixtures - Other means of separation Learning Points Chromatography separates pigments in a liquid....
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Very strange liquids
Not all liquids act the same ... some can behave very strangely indeed! Material processes - Solids, liquids and gases - Liquids Learning Points Liquids do not have a fixed shape. Non-Newtonian liquids change behaviour when a force is...
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Everyday liquids
What are the properties of a liquid? Material processes - Solids, liquids and gases - Liquids Learning Points Liquids do not have a fixed shape. The speed at which a liquid flows is known as viscosity. Liquids have fixed volume. The...
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Fractional Distillation - Oil Separation
Learn about fractional distillation and how it is used to separate crude oil. Material processes - Separating mixtures - Other means of separation Learning Points Distillation separates liquids using their different boiling points. The...
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Estados de la Materia - Sólidos, Líquidos y Gases
Aprende los conceptos básicos sobre los tres estados de la materia más conocidos: sólidos, líquidos y gases. ¿Qué es un estado de la materia? ¿Cuáles son las propiedades de los sólidos, líquidos y gases? La voz en este video es generada...