অষ্টম শ্রেণীর পরিবেশ ও বিজ্ঞান অধ্যায় 1.3 - তাপ পাঠ্য বইয়ের বিস্তারিত আলোচনা পর্ব - ৫
অষ্টম শ্রেণীর পরিবেশ ও বিজ্ঞান অধ্যায় 1.3 - তাপ পাঠ্য বইয়ের বিস্তারিত আলোচনা পর্ব - ৫
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00:00So, in this topic, what we are going to discuss is Ghani Bhavan.
00:20So, what is Ghani Bhavan?
00:22What is Ghani Bhavan?
00:24When someone is in a condensed state, if we do not remove the heat from there,
00:30then we call it Ghani Bhavan.
00:39You can see an example next to you.
00:42If you keep ice in a glass, water will come out of the glass.
00:49You can see water is coming out of the glass.
00:51You can see it on your own.
00:53This is an opposite process of condensation.
00:56We call this process of coming out of the condensation as Ghani Bhavan.
01:01There are many examples like this in our Bhai Mandala.
01:04In Bhai Mandala, Joliyo Bhasme is called Ghani Bhavan.
01:07That is why we make Megh, Shishir, Kuwasha.
01:12Now, when I say Megh, Puku, Nadi, Hath, Samudra, Bheeje Mati,
01:17our body is made up of water.
01:20So, where does all this Joliyo Bhasme mix?
01:24It mixes with the warm air around the world.
01:28The warm and more Joliyo Bhasme filled air is light compared to cold and less Joliyo Bhasme filled air.
01:36What happens to warm and less Joliyo Bhasme filled air?
01:39It rises upwards.
01:41As the height increases, the pressure decreases.
01:44That is why the air around the world increases the distance between us.
01:49The air becomes cooler.
01:51Then, the Joliyo Bhasme in the air,
01:54the air around the world,
01:56and other parts of the world,
01:58are condensed or condensed.
02:01The Joliyo Bhasme in the air,
02:04that is what we can see.
02:06What does that mean?
02:08We can say that,
02:10if the temperature of the air is low,
02:14the air becomes polluted.
02:16We will discuss this in the lecture.
02:18The Joliyo Bhasme in the air,
02:20the dust particles,
02:22they do not dissolve.
02:24The dust particles are condensed.
02:26So, the Joliyo Bhasme in the air,
02:28are condensed.
02:30When a lot of dust particles are condensed,
02:32we say that,
02:34they are made up of dust particles.
02:36So, what I was saying,
02:38what we call dew point,
02:40that is a constant temperature.
02:42If there is a constant temperature,
02:45the Joliyo Bhasme in the air,
02:47becomes polluted.
02:49We call that temperature,
02:51Shishiramko.
02:53Now, the question is,
02:55did we know Shishiramko?
02:57Now, if we try to know,
03:00that this Joliyo Bhasme in the air,
03:03there is a small experiment,
03:07so, I will say a little about that.
03:10A cup of tea,
03:13a small cup,
03:15is filled with water.
03:17What is done with it?
03:19A little salt is added.
03:21Now, in a similar way,
03:23if the salt is added,
03:25then what will happen to the salt?
03:27It will become polluted.
03:29So, if we keep adding salt to the water,
03:31there will come a time,
03:33when as much salt as possible,
03:35will go into the water,
03:37or may go,
03:39it will dissolve.
03:41So, we can say that,
03:43that temperature,
03:45is the constant temperature of salt.
03:47But, if we try more than that,
03:49then the salt,
03:51will not become polluted.
03:53That means,
03:55the salt that is left here,
03:57if more is added,
03:59then the salt will dissolve.
04:01But,
04:03if we add more water,
04:05then we can make it polluted again.
04:07Or, if we change the temperature,
04:09of the water,
04:11then also,
04:13there will be a little change.
04:15So, we can say,
04:17in the case of water and salt,
04:19in the same way,
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