Flammable Vapor Density 1965

Simply, vapor density is defined with respect to air. The vapor density indicates whether a vapor is more dense (or heavier) or less dense (or lighter) than air. In still air, a vapor heavier than air will tend to sink and, if flammable, collect until it is at a concentration sufficient for ignition. Even if not flammable, it could collect in the lower floor or level of a confined space and displace air, to present a smothering hazard to individuals entering the lower part of that space. A wonderful source of additional information on flammable materials can be found at: www.ccohs.ca . The site is from the the Canadian Centre for Occupational Health and Safety (CCOHS), a Canadian federal government agency based in Hamilton, Ontario. CCOHS makes a vast scope of occupational health and safety information readily available, in clear language that is appropriate for all users, from the general public to the health and safety professional. Internationally, the Centre is renowned as an innovative, authoritative occupational health and safety resource. This was clipped from the 1965 training film, Magic of Fire (23 minutes), produced by the US Bureau of Mines. The film deals with fire, its composition, uses and control. Tabletop displays and laboratory demonstrations illustrate how fires and explosions occur and describe the safe use and control of commonly used gases and flammable liquids. Shows various industrial fires (and fire hazards in the home) and gives instructions on
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