u201d refers to the aerosol mass density produced by an inhalation device and delivered into a typical patient tidal volume u201c inhalable aerosol particle density u201d refers to the aerosol particle density of particles of size between 100 nm and 5 microns produced by an inhalation device and delivered into a typical patient tidal volume u201c mass median aerodynamic diameter u201d or u201c mmad u201d of an aerosol refers to the aerodynamic diameter for which half the particulate mass of the aerosol is contributed by particles with an aerodynamic diameter larger than the mmad and half by particles with an aerodynamic diameter smaller than the mmad u201c rate of aerosol formation u201d refers to the mass of aerosolized particulate matter produced by an inhalation device per unit time u201c rate of inhalable aerosol particle formation u201d refers to the number of particles of size between 100 nm and 5 microns produced by an inhalation device per unit time u201c rate of drug aerosol formation u201d refers to the mass of aerosolized diazepam produced by an inhalation device per unit time u201c settling velocity u201d refers to the terminal velocity of an aerosol particle undergoing gravitational settling in air u201c typical patient tidal volume u201d refers to 1 l for an adult patient and 15 ml kg for a pediatric patient u201c vapor.