Boyle suggests that the process of combustion and respiration are due to a "nitrous" substance in air. He also creates "Boyle's Law," which says that the volume of air decreases as pressure on air ...

Lethal Concentration 50. The concentration of a substance in air that based on laboratory tests (inhalation exposure) is expected to kill 50% of a group of test animals when administered as a single ...

Aids burning. Found in air. Used to treat breathing problems A compound is a substance that contains atoms of two or more different elements, chemically joined together. For example, water is a ...

Per- and polyfluoroalkyl substances, or PFAS ... which lingers in the air and allows humans to breathe the chemicals into their lungs or ingest them. By dusting and vacuuming regularly, along ...

Russia has developed a system for monitoring hazardous substances in the air using an unmanned aerial vehicle. It not only records changes in the composition of the atmosphere, but is also able to ...

successfully thwarted an attempt to smuggle 1.2 tonnes of psychoactive substances. Specialised teams uncovered the shipment as it passed through the emirate's air cargo terminal, applying ...