External Links
States of matter, mixtures, solutions and more.
International System of Units (I).
Definitions and pronunciation for some of the units of the SI at the Visual Dictionary.
International System of Units (II).
More definitions and pronunciation for some of the units of the SI at the Visual Dictionary.
Measuring devices of temperature, time, weight, thickness, distance, length and angles in the Visual Dictionary.
Learn the most widely used units (and its abbreviations and equivalences) for area, length, load, mass, speed, time and volume.
Images, definitions and pronunciation of matter components, chemical elements and laboratory equipment in the Visual Dictionary.
How many protons, neutrons, and electrons are in common elements?
Visualize how atoms are related to common objects at Exploring Earth online book.
Can you name the elements of the Periodic Table?
Test how many names of chemical elements can you remember in 15 minutes.
Interactives: The Periodic Table.
Excellent advanced lesson on the Periodic Table and the structure of the atoms, with interactive activities.
Eight online games to teach you the chemical elements, periodic table, and more.
Periodic Table of the elements (I).
A very good Periodic Table to learn about the properties, occurrrence and the applications of every chemical element.
Periodic Table of the elements (II).
Another Periodic Table with good information about the structure of every chemical element, its name, its discovery and its utility.
Periodic Table of the elements (III).
In many different languages and with links to the Wikipedia articles on each one of the chemical elements.
Periodic Table of the elements in pictures.
This one presents, for every element of the Table, a picture of some object or material where the chemical element is present. Just great.
Learn about the chemical elements by watching one video for each one of them. Awesome.
An entertaining way to get to know their very strange names.
Examine 3-D models of common molecules.
Visualize common molecules at Exploring Earth online book.
Atoms, atomic particles, compounds and more.
Build interactively your favourite atom. (You've got one, don't you?). Tip: hit the "Next" button to the bottom, scroll up, and then hit "Enter" in your keyboard consecutively to not no have to scroll vertically anymore.
Plastics are everywhere. While you're reading this, there are probably numerous plastic items within your reach (your computer, your pen, your phone). A plastic is any material that can be shaped or molded into any form. Some are naturally occurring, but most are man-made. Learn more about them.
If you had to name the technologies that had the greatest effect on modern society, the refining of the heavy metal element iron would have to be near the top. Iron makes up a huge array of modern products, especially the carbon-rich one, which we call steel. Learn more.
View the inner structure of steel, progressively magnified.
View the inner structure of brass, progressively magnified.
View the inner structure of aluminium, progressively magnified.
View the inner structure of carbon fiber, progressively magnified.
View the inner structure of concrete, progressively magnified.
View the inner structure of a clay pot, progressively magnified.
Estimated time left for metals.
Giant chart showing that a looming future without underground metal reserves is not too far away. With additional charts about the rates of consumption and recycling of many widely used metals.