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.
Class A: Ordinary combustibles. Class A fires consist of ordinary combustibles such as wood, paper, fabric, plastic, and most kinds of trash. Class B/C: Flammable liquid and gas. A CO. 2 fire extinguisher rated for flammable liquids and gasses. These are fires whose fuel is flammable or combustible liquid or gas.