Get the allotrope definition in chemistry. See examples of allotropes of different elements, including those of carbon and oxygen.| Science Notes and Projects
Get examples of pure substances and impure substances and learn how to classify materials according to their chemical composition.| Science Notes and Projects
Get the liquid definition in chemistry and other sciences. See examples of liquids in everyday life. See what is not a liquid.| Science Notes and Projects
Hydrogen is the first element of the periodic table. These hydrogen facts include general info, history, and chemical and physical data.| Science Notes and Projects
Learn about deuterium. Get facts about what it is, its properties, uses, and sources. See whether it's radioactive.| Science Notes and Projects
Get the definition of a gas in science. See examples of gases including elements, mixtures, and gases in everyday life.| Science Notes and Projects
Get the phase change definition in chemistry and print a phase change diagram for the transitions between solids, liquids, gases, and plasma.| Science Notes and Projects
Get the definition of a solid in chemistry and other sciences. Learn the properties of solids and see examples.| Science Notes and Projects
Learn what temperature is in science. Get the temperature definition, units, and examples and see how it differs from heat.| Science Notes and Projects
Get the pressure definition in science. See its units and get example of pressure and how to calculate it.| Science Notes and Projects