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• Amount of substance — is a standards defined quantity that measures the size of an ensemble of elementary entities, such as atoms, molecules, electrons, and other particles. It is sometimes referred to as chemical amount. The International System of Units (SI) defines …   Wikipedia

• Fire fighting foam — Firefighters sprayed foam on structures in the Mammoth Hot Springs complex on September 10, 1988 during the Yellowstone Fires. Fire fighting foam is a foam used for fire suppression. Its role is to cool the fire and to coat the fuel, preventing… …   Wikipedia