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 IA: Liquids with a flash point below 73Â°F (23Â°C) and a boiling point. below 100Â°F. Examples: acetaldehyde, butyne, chloropropylene, dimethyl. sulfide, ethyl chloride, ethyl ether. Class IB: Liquids with flash point below 73Â°F and a boiling point at or above.