Zeotropic mixture harmful effects that hydrochlorofluorocarbons (HCFC) and chlorofluorocarbons (CFC) have on the ozone layer and global warming. Researchers have focused on using new mixtures that have the same properties as past refrigerants to phase out harmful halogenated substances, in accordance to the Montreal Protocol and Kyoto Protocol. For example, researchers found that zeotropic mixture R-404A can replace R-12, a CFC, in household refrigerators. However, there are some technical difficulties for using zeotropic mixtures. This includes leakages, as well as the high temperature glide associated with substances of different boiling points, though the temperature glide can be matched to the temperature difference
The Rise and Fall of English Montreal The Rise and Fall of English Montreal The Rise and Fall of English Montreal is a 1993 Canadian documentary film directed by William Weintraub and produced by the National Film Board of Canada in Montreal. The film deals with exodus of English-speaking Quebecers that began in the 1960s and was accelerated by the Quebec general election, 1976. The film includes interviews with English-speaking professionals and students that are preparing to leave Montreal, joining an exodus of 300,000 anglophones that left the province in the last two decades. This exodus is reflected in over 100 English-speaking schools that have closed in