Amount of substance in use in chemical engineering in the United States is the pound-mole, having the symbol lb-mol. One pound-mole is . When quoting an amount of substance, it is necessary to specify the entity involved, unless there is no risk of ambiguity. One mole of chlorine could refer either to chlorine atoms, as in 58.44 g of sodium chloride, or to chlorine molecules, as in 22.711 liters of chlorine gas at STP. The simplest way to avoid ambiguity is to replace the term "substance" by the name of the entity or to quote the empirical formula. For example: Amount of substance
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