In science, chemicals are elementary substances such as oxygen, hydrogen, nitrogen, etc. In the context of home composting, however, the word "chemical" is often used to describe a philosophy considered to be in opposition to the organic philosophy. In general, the chemical philosophy encourages people to force nature to do what they want by applying synthetic pesticides and fertilizers which may get the temporary results they want, but may harm or not enhance the general soil condition and environment.
Chemical engineering applies principles of chemistry and physics to the design and production of materials that undergo chemical changes during their manufacture. Chemical engineers also participate in efforts to maintain a clean environment and to create substitutes for or find ways to preserve our natural resources.
a health hazard if there is statistically significant evidence, based on at least one study conducted in accordance with established scientific principles that acute or chronic health effects may occur in exposed employees
Hygiene Plan A written program developed and implemented by the employer which sets forth procedures, equipment, personal protective equipment, and work practices that are capable of protecting employees from the health hazards presented by hazardous chemicals used in that particular workplace. The ECU plan is available for view on the EHS web page at http://www.ecu.edu/oehs/labsafetymain
peeling—a chemical solution is applied to the skin, causing the skin to blister and peel off over a period of days. As the treated skin peels off, new and more pliant skin replaces it. Chemical peeling is a procedure for facial skin rejuvenation.