Certain conditions such as heat and light may make a substance more reactive. An explosion is a very rapid reaction. Sensitizer Repeated exposure may cause a marked response not necessarily limited to the site of contact. The amount of a substance that can be dissolved in a solvent usually water. A liquid in which other substances are dissolved.
Water is a common solvent.
Teratogen Causes growth abnormalities in the fetus. The capacity of a substance to produce a harmful effect when the substance has reached a suflicient concentration at a certain site in the body. Toxic Substance A substance which can cause acute or chronic injury. TWA Time weighted average. The TLV for an eight hour workday.