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The Science of Snowflakes
Snowflakes are infinitely beautiful, but are they infinitely unique? Here's all the science behind Earth's favorite cold crystal
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Molecules, compounds and types of chemical bonds
What is the difference between a molecule and a compound? What are the main types of chemical bonds? In this video, we will be answering those questions and more.
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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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Hydrated compound
A solid compound that contains water molecules in a defined ratio. 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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Types of Weather: Rain
Rain is essential to our planet. Without it, all life on Earth would struggle to survive. How do rain clouds form and what determines whether it rains or not? Earth Science - Weather - Learning Points. Rainfall comes from the clouds...
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Rusting Nails
We investigate the conditions needed for rust to form. Four iron nails are placed under different conditions. One is half submerged in water. Another is completely submerged in boiled water. One is half submerged in salt water. The final...
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Filtration and Evaporation
We use filtration and evaporation to separate out a mixture of water, sand and salt. The sand is removed using filtration, as it did not dissolve in the water. The remaining solution is heated until the water evaporates, leaving behind...
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Hydrogels
We use a disposable nappy to examine the superabsorbent properties of hydrogels. We add water to grains of hydrogel and watch them swell before adding salt to see the water escape. Chemistry - Chemical Industries - Learning Points....
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How Do Snowflakes Form?
A blizzard creates a blanket of snow. Look closer and the true beauty of individual snowflakes can be seen. How are different shapes of snowflakes formed and why are they always perfectly symmetrical? Chemistry - Atoms And Bonding -...
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Salt: Salt and Ice
Salt is routinely used to melt snow and ice on winter roads. But what is happening at the molecular level to cause this helpful change of state? Chemistry - Atoms And Bonding - Learning Points. When salt is added to water it lowers the...
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Carbohydrate
Molecules such as sugar and starch, which form an important energy source for living organisms. A Twig Science Glossary Film. Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...
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Liquefaction
A fascinating example of a solid behaving as a liquid. Material processes - Solids, liquids and gases - Solids Learning Points Liquefaction causes solid soil to take on some characteristics of liquids. A Twig Context Film. Reinforce and...
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Separation by evaporation
Learn how to find out the difference between tap water and spring water. Material processes - Separating mixtures - Separation by evaporation Learning Points Evaporation can be used to separate a solution. A solution is formed when a...
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Matter and its Construction: Heat of Fusion and Vaporization
By the end of this learning object, the student will be able to: Recognize the concept of heat of fusion and vaporization16331
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States of Matter
Dr. Forrester explains how different forms of matter can exist in different states.
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Does Water Expand When It Freezes?
Yes, water expands when it freezes. Note that the word “expands” here indicates an increase in volume. So, a technically sound way to put it would be—water’s volume increases when it freezes. This statement is accurate, and you can test...
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GCSE Physics - Microwaves and Infrared #66
This video covers: - How microwaves are used to heat food - How microwaves are used in satellite communication - The idea that hotter objects emit more infrared radiation - How we use infrared radiation to cook things General info: -...
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GCSE Biology - Osmosis #8
In this video, we cover: - What osmosis is - How osmosis works - How to understand water concentration Exam board specific info: AQA - Suitable for everyone IGCSE Edexcel - Suitable for everyone Edexcel - Suitable for everyone OCR 21st...
Professor Dave Explains
Plant Ecology (Flora)
With various environments better understood, it's now time to look at specific types of organisms. Let's start with plants, also known as flora. We learned about these in the botany series, but now let's contextualize some of that...
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Thermostatic Radiator Traps - Steam heating HVAC
Thermostatic radiator traps are used in steam heating systems. They are installed in 2 pipe steam heating systems, to prevent steam passing through and returning to the boiler. We cover the basics of a steam heating system, the boiler,...
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Steam Heating Systems Basics hvacr
Steam heating system basics. Learn the basics of how steam heating systems work and where steam heating systems are used.