Everything that surrounds us is made of atoms – tiny particles of matter. Connecting with each other, they form a molecule – the smallest particles of matter that still retain the properties of atoms. For example, a water molecule consists of two atoms hydrogen and one oxygen atom. Molecules of solids are firmly bound together, the molecules of liquids relationship is weaker and the molecules of gas are almost free and move in any direction. Previously it was thought that the atom – is the smallest 'Brick' of matter. But then scientists discovered that they consist of even smaller particles. Atomic nucleus composes of two types of particles: positively charged protons and neutrons have no charge.

Revolve around the core electrons each of which carries a single negative charge. What is in flames Flames – a mixture of red-hot glowing particles produced during combustion of solid, liquid or substances. To see it, you need to heat oxygen and combustible material. The match breaks out only when the friction of its box is allocated a lot of heat to the oxygen and sulfur, the reaction started – burning. If you blow on a match, the temperature drops and the burning stops.