Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes. marina - a harbor for pleasure boats; maritime - relating to the sea; submarine - an undersea boat; aquamarine - color of sea water.
Chemicals are classified into various hazard classifications in accordance with their physiochemical properties and health hazards. Each class of chemical has a pictorial symbol called a danger symbol.
Wet chemical. Specialist extinguisher for class F fires. For Metal Fires: A specialist fire extinguisher for use on Class D fires-metal fires such as sodium, lithium, manganese and aluminium when in the form of swarf or turnings.