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 ...

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 ...

Substances also need to enter or leave whole organisms and this often requires diffusion too. Oxygen from the air passes into the bloodstream in the lungs through structures called alveoli.