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Substance (matter) is everything that has as mass and a volume. (... everything that weighs and needs space)
* Left: Water is the most important substance: More than half of the earth´s surface and of all creature  are made of it.
* 2. Photo: A grain of sugar, salt and citric acid are white substances.
* 3. Photo: The wood of a match and its read head are two different substances with different colours,
                  The  coal left after the combustion of the match is a black brittle substance.
* Right: Red rust is another brittle substance which is made from steel which is a flexible substance with a silvery shine.