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Foam extinguishers : If the burning liquid is in a container the jet should be directed at the inside edge of the vessel or at a vertical surface in order to break the jet and allow the foam to build up and spread across the surface of the liquid (Figure). If this is not possible, the correct procedure is to stand well back (perhaps as far as 6 or 7 m) and to direct the jet with a gentle sweeping movement to allow the foam to drop down and form a layer on the surface of the liquid (Figure). Do not aim the jet directly into the liquid as this will drive the foam under the surface where it will be ineffective in extinguishing the fire and may spread the fire by splashing the liquid on the surroundings.
Figure: Use of foam extinguisher-I. Fig.12.4: Use of foam extinguisher-11.
Explain the texture of igneous rocks? There are four main textures of igneous rocks which are used to classify them. The rate of cooling and crystal growth account for the diff
Oxidation Weathering by oxidation is common in rocks which are rich in the elements that can be easily oxidised e.g. iron. Iron as Fe 2+ present in a mineral is oxidised to Fe
Decribe the factors which decide the broad area of scientific activity
how many element found in nature.
advantages and disadvantages of protozoa
Flammable Solids : Flammable solids are substances which are flammable or liable to spontaneous combustion or emit flammable gases on contact with water. Examples are: camphor, ci
Functions of communication: Broldly the main role of communication in a social system is : Receiving and conveying.information which may be facts, messages or opnions; this
true or false? water conservation efforts have been wholly inaffective
WHAT ARE THE APPLICATIONS OF LP
Q. What is the major source of fresh water in the city/town/village where you live? Answer : River is a major source of fresh water.
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