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
Compound modifier both (or all) of the words in a compound modifier are nouns, it is seen as not necessary to hyphenate them, as misunderstanding is unlikely. Japanese equivalents of adjectives can compound. This is quite common for "na"-adjectives, which function essentially as attributive noun phrases, while it is relatively uncommon for "i"-adjectives, and is much less common than Japanese compound verbs. Common examples include (noun + "i"-adjective) and ("i"-adjective stem + "i"-adjective). Compound modifier A compound modifier (also called a compound adjective, phrasal adjective, or adjectival phrase) is a compound of two or more attributive words: that is, two or more