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Controlling Fire

Ways to Control FireFire control and Fire Extinguisher

Transcript

  • 0:3Imagine two kids - Tom and Harry have
  • 0:7
  • 0:7holiday today and they're playing with
  • 0:9
  • 0:9each other, but what are they playing
  • 0:12
  • 0:12with? They are playing with burning matchsticks.
  • 0:14
  • 0:14Now, while playing, Tom accidentally
  • 0:18
  • 0:18drops his burning match stick on Harry.
  • 0:21
  • 0:21Poor Harry catches fire. But then
  • 0:25
  • 0:25what do Tom do in such a case?
  • 0:27
  • 0:27Tom is a smart boy. So, he covers Harry
  • 0:30
  • 0:30immediately with the blanket.
  • 0:33
  • 0:33Why do you think Tom would have done this?
  • 0:35
  • 0:35Because he knew what are the conditions
  • 0:39
  • 0:39required for a substance to burn. He knew
  • 0:42
  • 0:42what are the reasons that caused the fire.
  • 0:45
  • 0:45Well, it is very important for us to know
  • 0:49
  • 0:49the reason behind the substance catching
  • 0:51
  • 0:51fire, to extinguish the fire.
  • 0:54
  • 0:54Let us recall the conditions required for
  • 0:57
  • 0:57combustion. Ok. The conditions required
  • 0:59
  • 0:59for a substance to burn or the
  • 1:2
  • 1:2conditions required for combustion
  • 1:4
  • 1:4are, first is the fuel. Fuel is nothing but
  • 1:7
  • 1:7the substance that burns. Second - is air. Air
  • 1:11
  • 1:11supplies oxygen and third - is heat. The
  • 1:16
  • 1:16heat is required to raise the
  • 1:18
  • 1:18temperature of the substance to its
  • 1:20
  • 1:20ignition temperature. Now, to extinguish
  • 1:23
  • 1:23fire, we need to eliminate these reasons.
  • 1:27
  • 1:27We can eliminate one or two reasons also
  • 1:30
  • 1:30to extinguish fire. Now, in our Tom and Harry
  • 1:34
  • 1:34case, what happens is Tom covers Harry
  • 1:38
  • 1:38with the blanket to eliminate the second
  • 1:42
  • 1:42condition that is oxygen. When he
  • 1:44
  • 1:44covers Harry with the blanket, the oxygen
  • 1:47
  • 1:47supply is cut from the fire. So,
  • 1:49
  • 1:49immediately the fire stops. Here, the
  • 1:52
  • 1:52fuel was Harry. So, we cannot eliminate
  • 1:54
  • 1:54Harry. So, eliminating the second
  • 1:57
  • 1:57condition easily allowed Tom to
  • 1:59
  • 1:59extinguish the fire. But now the story
  • 2:2
  • 2:2doesn't end here.
  • 2:3
  • 2:3What happened was, when Harry started
  • 2:6
  • 2:6burning, he by mistake dropped his
  • 2:9
  • 2:9burning match stick on the curtains. The
  • 2:12
  • 2:12curtains started catching fire due to this
  • 2:14
  • 2:14and soon the entire
  • 2:16
  • 2:16room caught fire. Now, what should Tom and Harry
  • 2:20
  • 2:20do in such a situation?
  • 2:22
  • 2:22Well, they cannot take the blanket and
  • 2:24
  • 2:24cover the entire room this time. So, they
  • 2:27
  • 2:27thought of eliminating the third
  • 2:29
  • 2:29condition. That is heat. That could be
  • 2:32
  • 2:32done only by water. So, they started
  • 2:35
  • 2:35pouring water on all the substances due to
  • 2:39
  • 2:39which the materials cool down and that
  • 2:42
  • 2:42temperature went below the ignition
  • 2:44
  • 2:44temperatures and so the fire was
  • 2:46
  • 2:46extinguished. But imagine, now if the
  • 2:50
  • 2:50whole building catches fire then, what
  • 2:52
  • 2:52would Tom and Harry do? Here, the entire
  • 2:56
  • 2:56building is the fuel. So they cannot
  • 2:58
  • 2:58eliminate the building. So, they cannot
  • 3:0
  • 3:0eliminate the first condition required
  • 3:2
  • 3:2for combustion that is fuel. So,
  • 3:4
  • 3:4Tom and Harry thought of eliminating
  • 3:6
  • 3:6this two more conditions that is air
  • 3:8
  • 3:8supply and heat. Now here, because the
  • 3:13
  • 3:13fire is spreading continuously, we have to
  • 3:15
  • 3:15eliminate both these factors
  • 3:16
  • 3:16simultaneously. For this, they immediately
  • 3:20
  • 3:20called the fire brigade. The fire brigade
  • 3:23
  • 3:23started pouring water, a lot of water
  • 3:25
  • 3:25with greater force. Now, due to which all the
  • 3:28
  • 3:28combustible materials cool down and the
  • 3:31
  • 3:31temperatures went below the ignition
  • 3:34
  • 3:34temperature and the water vapor so formed
  • 3:38
  • 3:38covers the combustible materials. So, the
  • 3:41
  • 3:41oxygen supply is cut off. Now, what have
  • 3:45
  • 3:45we learned from this lesson? We've
  • 3:47
  • 3:47learned that to extinguish fire, we need
  • 3:50
  • 3:50to eliminate the reasons that caused
  • 3:52
  • 3:52this fire. The reasons are fuel, air and
  • 3:58
  • 3:58heat. In most cases, we cannot eliminate
  • 4:1
  • 4:1the fuel. So, we have to eliminate the
  • 4:3
  • 4:3other two factors and also you have to
  • 4:6
  • 4:6remember that in case of emergency,
  • 4:9
  • 4:9we have to keep the telephone numbers of
  • 4:11
  • 4:11fire brigade's service handy.
  • 4:13
  • 4:13Why don't you note down the telephone
  • 4:16
  • 4:16number of the fire brigade service in
  • 4:17
  • 4:17your area and remember to be very
  • 4:21
  • 4:21careful with inflammable substances like
  • 4:23
  • 4:23Match stick!

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