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.
Letâs break this down: A chemical is any substance that can be defined by its atomic or molecular composition. That covers a lot of ground! Any element is a chemical, an element being any substance that can be defined by a single atom. Thus hydrogen (H) and oxygen (O) are chemicals. Any compound is also a chemical, a compound being any substance defined by two or more bonded atoms. Thus water (H2O), consisting of bonded hydrogen and oxygen, is a chemical.