Chemical substance made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, in practice, no substance is entirely pure, and chemical purity is specified according to the intended use of the chemical. Chemical substances exist as solids, liquids, gases, or plasma, and may change between these phases of matter with changes in temperature or pressure. Chemical substances may be combined or converted to others by means of chemical reactions. Forms of energy, such as light and heat, are not matter, and are thus not "substances" in this
Chemical garden obtained Common salts used in a chemical garden include: While at first the chemical garden may appear to be primarily a toy, some serious work has been done on the subject. For instance this chemistry is related to the setting of Portland cement, hydrothermal vents and during the corrosion of steel surfaces tubes can be formed. A chemical garden helps one to understand the nature of that chemical substance. The nature of the growth also is useful in understanding classes of related behavior seen in fluids separated by membranes. In various ways it resembles the growth of spikes or blobs