LC50 27 : The concentration of a material in air that on the basis of laboratory tests (inhalation route of entry) is expected to kill 50% of a group of test animal when administered as a single exposure in a specific time period
Environmental Health and Safety, Glossary, University of Chicago, Illinois, USA 2010. http://safety.uchicago.edu/tools/glossary.shtml, (Ergo - Amer) {753}