Condensed aerosol fire suppression is a particle-based form of fire suppression agent similar to gaseous fire suppression or dry chemical. The aerosol employs a fire extinguishing agent consisting of very fine solid particles and gaseous matter to extinguish fires. The condensed aerosol microparticles and effluent gases are generated by the exothermic reaction; until discharged from the device, the particles remain in vapor state. They are cooled and "condensed" within the device and discharged as solid particles. Compared to gaseous suppressants, which emit only gas, and dry chemical suppression agents, which are powder-like particles of a large size (25–150 micrometres), condensed aerosols are defined by NFPA as releasing finely-divided solids of less than 10 micrometres in diameter. The condensed aerosol agent can be delivered by means of mechanical operation, electric operation, or combined electro-mechanical operation. It is environmentally friendly.