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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.
Modern Concept of Preventive Medicine: Now let us see how the current concept of preventive medicine came into being. The story began only 150 years ago. People returning
Explain Functions of the Pancreas - Digestive Action Trypsinogen and chymotrypsinogen are the inactive proteolytic enzymes of the pancreatic juice. When they come in contact wi
Miller's Experiment The above theory could be tested by recreating in the laboratory on a small scale, the conditions which must have existed when life originated on the
Some Features of the Forests: Forests are the most widespread stretches of vegetation, harbouring diverse kinds of life forms. They are dominated by trees. Besides trees, f
if a force of 26 n is exerted on two baLLS one with a mass of 0.52kg ands the other with mass of 0.78kg which ball will have the greater acceleration explain
#question.find the specific gravity of blood lymph and water.?
Applications of Laser: Due to its properties, laser light can be put to a number of uses in industry, medicine, communications etc. We will briefly describe some of these us
If more of substance b dissolves b has a higher what than substance a
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
descibe the factors which decidethe broad area of scientific activity?
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