An aeriform fluid of fine particles suspended in air, produced and vented as a byproduct of the operation of wheeled machines or conveyances self-propelled by internal combustion engines. (Source: RHW / MHD)
An aeriform fluid of fine particles suspended in air, produced and vented as a byproduct of the operation of wheeled machines or conveyances self-propelled by internal combustion engines. (Source: RHW / MHD)