Latent Heat
Latent Heat
Latent Heat Of Vaporisation:
The latent heat of vaporisation of a substance is defined as the quantity of heat gained by 1 kg of the substance in changing from liquid to vapour state or from vapour to liquid state at constant temperature.
When you heat a liquid, its molecules start moving faster and gain kinetic energy. This shows as a rise in its temperature. At the boiling point, however, the heat supplied is used by the molecules to break away from the inter-molecular force and change into vapour molecules, rather than to move faster.This is why there is no change in the temperature. The heat required to help the molecules of liquid to overcome the inter-molecular forces and to escape as a vapour molecules is known as the latent heat of vaporisation.
Latent Heat Of Fusion:
The latent heat of fusion is defined as the quantity of heat gained by 1 kg of substance in changing from the solid to liquid at same temperature.
When a solid is heated, its molecules start vibrating faster and its temperature rises until it reaches the melting point. Then the temperature remains constant until the entire solid changes to liquid. The heat supplied during the process is used by the molecules to overcome the inter-molecular force, and not to raise the temperature.This heat is called the latent heat of fusion. It is gained by the solid molecules to change to liquid molecules at constant temperature.
In the reverse process, liquid molecules lose the latent heat of fusion to change to solid molecules at the freezing point. During this process too the temperature remains constant.
The heat required to help the molecules of liquid to overcome the intermolecular forces and to escape as a vapour molecules is known as the _______________________ . | |||
| Right Option : C | |||
| View Explanation | |||
The latent heat of fusion is gained by the solid molecules to change to _____________________ molecules at constant temperature. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) The latent heat of vaporisation of a substance is defined as the quantity of heat gained by 1 kg of the substance in changing from liquid to vapour state . (b) The latent heat of fusion is defined as the quantity of heat gained by 1 kg of substance in changing from the solid to liquid . (c) At the boiling point the heat supplied is used by the molecules to break away from the inter-molecular force and change into vapour molecules. | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [20]
My experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
Hridey Preet
9thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Om Umang
10thMy experience with Abhyas Academy has been very good. When I was not in Abhyas whenever teacher ask questions I could not speak it confidently but when I came in Abhyas, my speaking skills developed and now I am the first one to give the answer of teachers question.
Upmanyu Sharma
7thAbhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Shreya Shrivastava
8thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
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Manish Kumar
10thAbhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Aman Kumar Shrivastava
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
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Yogansh Nyasi
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Archit Segal
7thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thUsually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
Anika Saxena
8thThe experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
Aman Kumar Shrivastava
10thAbhyas academy is great place to learn. I have learnt a lot here they have finished my fear of not answering.It has created a habit of self studying in me.The teachers here are very supportive and helpful. Earlier my maths and science was good but now it has been much better than before.
Barkha Arora
10thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thWe started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
Manya
8thWhen I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
