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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 Mucous membranes - External Defence Mechanism Mucous membranes: The digestive, urinary, genital and respiratory tracts open out at one or both ends. They do not have a
Explain Undifferentiated Cells in an Organism These cells are capable of undergoing division and development, for example, the stem cells (animals) and meristematic cells (plan
Explain Cholecystokinin - Movements of Gall Bladder Cholecystokinin: Active contraction of gall bladder during digestion is due to the hormone cholecystokinin. Acid extracts o
Navigation and Astronomy: As we have said earlier, by the edd of the Middle Ages, trade on land and over the seas was being Sken up on a big scale. By the fifteenth centur
father of environmental microbiology
Ligases (synthetases) These enzymes (code EC 6) catalyze the linkage of two molecules coupled with the hydrolytic breakdown of a pyrophosphate bond in ATP or an analogous co
In hydraulic machines a liquid that has filled a pipe is pushed at one end of the pipe. The liquid then pushes a machine part located at other end of the pipe. Why isn''t gas used
so say if a car was going at 50km in a hour I would not no how to work it out help me:(
how is there a chemical change
Define age related changes in Special Senses Presbyopia (decline in the ability to focus near objects), senile cataract etc. can be observed as eye dysfunction. Ear shows dimin
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