Coal
Coal
Coal: Coal is black or brownish black in color. It is one of the oldest fuels. It is mainly made up of carbon along with other elements mainly hydrogen, sulphur, oxygen.
Carbonisation : The process of coal formation is known as carbonisation. The dead plants and vegetation due to temperature and high pressure over hundreds of years slowly turned into coal. This slow conversion of dead plants and forests into coal is called the process of carbonisation.
Formation of coal: Trees and other plants grown in swampy areas around 300 to 400 years ago died and remains got buried. In low oxygen conditions, high temperatures and absence of air, they formed a dark brown material called peat. Peat was compressed between layers of sediments and formed lignite. Even further compression resulted in formation of Anthracite. Depending on its carbon content it can be divided into three main types:
1. Anthracite: It has carbon content 92-98% and mainly used for heating. It is hard, black and glossy and is the source of any other fuel.
2. Bituminous coal: It has carbon content 60-80% and mainly used in heat and power generation and manufacturing of coke.
3. Lignite: It has carbon content around 25-35% and has lowest grade of coal. Commonly called brown coal. It is highly volatile and used in power generations.
Coal is processed further to obtain useful materials by destructive distillation(heating of coal at high temperature in absence of air in controlled environment).
Which of the following is not a part of coal formation? | |||
| Right Option : D | |||
| View Explanation | |||
Which is the best variety of coal out of the following ? | |||
| Right Option : C | |||
| View Explanation | |||
Coal is formed by the process of _______________ | |||
| Right Option : A | |||
| View Explanation | |||
Students / Parents Reviews [10]
About 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 with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
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
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
10thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
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
8thAbhyas 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
10thIt 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
10thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
