Air conditioners often contain a high-efficiency particulate air (HEPA) filter inside the unit to remove small particulates from the cooler air. An inlet stream to an air conditioner is composed of m1g/s of air and m2g/s of particulates. The air/particle mixture is run through a filter in which a fraction of the particulates are trapped. Then, all of the air and the remaining particulates flow through the outlet of the air conditioner. The outlet stream is composed of m3g/s of air and m4g/s of particulates. Apply the general balance equation to each species in the mixture: first to air and then to the particulates. First, apply the balance equation for the air only (not the air/particulate mixture) around the air conditioner. Classify the terms in the general balance equation for air as zero or nonzero