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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.
Lab hygiene : The need for continuous attention to hygiene in any type of laboratory cannot be overemphasised. Any spillage of chemicals, battery acid, blood, plasma, serum, etc.
Explain Brain or Detector - Mechanism of Colour Perception The fibre identification of colour takes place in the brain. If any of these four pre-requisites are not present, the
Military Technology: Important changes were introduced in military technology. Rope and wooden stimps for horsemen were known in India before the thirteenth century. However,
factors which decide the broad area of Scientific activity
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This assignment relates to working with an individual in a social care setting to plan, carry out and evaluate an activity which promotes the development of the individual. The can
Describe the differences between tumor staging and tumor grading, and how each is performed. Relate the role of your particular imaging modality in staging and or grading, if any
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