What is off-gassing?

מה שקורה בגוף של שפר

גז זה חומר

חומרים פולטי גז

GPT explains (level =C2; CEFR aligned): Off-gassing – the slow exhalation of built materials Off-gassing denotes the spontaneous release of volatile organic compounds (VOCs), semi-volatile organics and other gases from solid or liquid materials into the surrounding air at ambient temperatures. Freshly manufactured goods—plywood, carpets, paints, upholstery foams, electronics—contain residual solvents, plasticisers, fire retardants or formaldehyde-based resins; over time these molecules diffuse out of the matrix, degrade indoor-air quality and may contribute to “new-building” odour, mucous-membrane irritation or sick-building syndrome. Because the phenomenon is intrinsic to the material itself and does not require combustion, vehicle exhaust or digestion, “emission of gases from materials” is the precise engineering and occupational-health definition.