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Q7. With reference to fire smothering agents explain as to why:

A. Effectiveness of foam is directly related to its degree of effervescence and surface tension? (7)

B. Low expansion foam is best suited for use against localized fire, whilst high expansion foam is most effective in major conflagrations?        (7)

C. In the absence of foam appliances, water jets can be effectively used against oil fires? (5)

D. Explain how a mixture of foam making compound and sea water are converted into foam (5)