Class 8_Poribesh O Bigyan_Chapter 1_3_Heat_Part 3_Sahaj Shiksha
Class 8_Poribesh O Bigyan_Chapter 1_3_Heat_Part 3_Sahaj Shiksha
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00:30heat from the lower part of the body to the upper part of the body
00:39heat from the upper part of the body to the lower part of the body
00:48this is called heat transfer
00:52heat transfer can be done in 3 ways
00:581. Pari Bahan
01:052. Pari Chalon
01:133. Viki Ran
01:17In these 3 ways, heat is transferred from one place to another
01:24When heat is transferred from the upper part of the body to the lower part of the body,
01:35there is no change in the position of the body
01:41Pari Bahan can be done only in the case of difficult objects
01:49Pari Bahan can be done only in the case of difficult objects
01:56Pari Bahan can be done only in the case of difficult objects
02:01Pari Bahan can be done only in the case of difficult objects
02:06For example, you try to look at the fire on the corner of a hard object
02:13For example, you try to look at the fire on the corner of a hard object
02:20First, heat will be transferred from the lower part of the body to the upper part of the body
02:25Then, heat has to be transferred from one place to another
02:31This is how slowly the heat is transferred from one source to another.
02:38The heat is transferred from one region to another, but there is no change in the source.
02:48This is the effect of the heat transfer method.
02:54Which can be seen only in hard material, but not in steel or gas.
03:00For this process, we have seen that we need a hard material.
03:06And the more the edges of the material are rough, the faster it will be processed.
03:15A dry material will never be processed in a dry method.
03:24In steel, the process of heat transfer is faster.
03:33This is the process of processing.
03:40In this process, the edges of the material change from one place to another.
03:54If this happens, the material will change from one place to another.
04:02This is called the process of heat transfer.
04:07The heat is transferred from one region to another.
04:12That is why we need a method for heat transfer.
04:16The process of heat transfer can be seen in steel and gas.
04:21In steel and gas, the process of heat transfer is the same.
04:34But in hard material, the process of heat transfer is not used.
04:43In the process of heat transfer, only steel and gas are used.
04:48But in hard material, the process of heat transfer is not used.
04:53For this process of heat transfer, we need a method for heat transfer.
05:08Before that, let me tell you a few more things about the process of heat transfer.
05:13Before that, let me tell you a few more things about the process of heat transfer.
05:18Before that, let me tell you a few more things about the process of heat transfer.
05:23Before that, let me tell you a few more things about the process of heat transfer.
05:28Before that, let me tell you a few more things about the process of heat transfer.
05:34After many years, the process of heat transfer continues.
05:40After many years, the process of heat transfer continues.
05:46Because the heat is transferred from one region to another.
05:49Because the heat is transferred from one region to another.
05:52Because the heat is transferred from one region to another.
05:55If I blow a candle, all the air in the candle will be hot.
06:10If I blow a candle, all the air in the candle will be hot.
06:11And this air will rise up slowly.
06:17And this air will rise up slowly.
06:20And this air will rise up slowly.
06:23And this air will rise up slowly.
06:26And this air will rise up slowly.
06:29And this air will rise up slowly.
06:32And this air will rise up slowly.
06:35And this air will rise up slowly.
06:38And this air will rise up slowly.
06:41And this air will rise up slowly.
06:44And this air will rise up slowly.
06:47And this air will rise up slowly.
06:50And this air will rise up slowly.
06:53And this air will rise up slowly.
06:56And this air will rise up slowly.
06:59And this air will rise up slowly.
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07:14And this air will rise up slowly.
07:17And this air will rise up slowly.
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07:23And this air will rise up slowly.
07:26And this air will rise up slowly.
07:29And this air will rise up slowly.
07:32And this air will rise up slowly.
07:35And this air will rise up slowly.
07:38And this air will rise up slowly.
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07:44And this air will rise up slowly.
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07:50And this air will rise up slowly.
07:53And this air will rise up slowly.
07:56And this air will rise up slowly.
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08:44And this air will rise up slowly.
08:47And this air will rise up slowly.
08:50And this air will rise up slowly.
08:53And this air will rise up slowly.
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