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.
Chemical substances are any materials (in any state-solid, liquid or gas) that have a definite chemical composition. Chemical substances can therefore be either a pure chemical element or a pure chemical compound. Chemical substances are any materials (in any state-solid, liquid or gas) that have a definite chemical composition. Chemical substances can therefore be. a pure chemical element. a pure chemical compound.