NCERT Class 7 Geography Chapter 4: Air (Examrace -Dr.Manishika) | English | CBSE

Dr. Manishika Jain explains the NCERT Class 7 Geography Chapter 4: Air.

The following topics have been covered:
Composition of Atmosphere
Structure of Atmosphere
Weather vs. Climate
Earth receives only 1 in 2,000,000,0000 parts of the sun’s energy
Weather: hour to hour / day to day
Instruments
Thermometer: Temperature
Barometer: Pressure
Rain Gauge: Amount of Rainfall
Wind Vane: Direction of Wind
Temperature
Degree of hotness or coldness of air
Temp Change b/w day & night, season to season (Summers are hot)
Insolation: Incoming Solar Radiation
↓ Equator to Poles
High Temp in Cities: Concrete, Cement, Asphalt – Trap Heat
Standard unit of measuring temperature is degree Celsius

Chapters:
0:00 introduction: NCERT Class 7 Geography Chapter 4: Air
0:08 Composition of Atmosphere
3:16 Structure of Atmosphere
5:51 Weather vs. Climate
7:32 Instruments
7:37 Thermometer
7:48 Barometer
7:58 Rain Gauge
8:10 Wind Vane
8:26 Temperature
11:17 Pressure
15:42 Winds
19:53 Moisture

#Moisture #Pressure #Concrete #Temperature #Gauge #Weather #Structure #Atmosphere #Composition #Manishika #Examrace

Pressure
Pressure exerted by the weight of air on the earth’s surface
Pressure ↓ with height (Max. at sea level)
Distribution – Horizontally
Air heats & rise – High Temp. – Creates LP – Cloudy & Wet
Low Temp.– Air is cold, heavy, dense, sinks – HP – Clear & Sunny Skies
Winds
Moisture

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[Examrace]

Errata in Diagram: COMPOSITION OF ATMOSPHERE nitrogen-78%, oxygen-21% and remaining 1%.

[IAKhan-kmph]

Dear Miss, I am a teacher from Pakistan. I am so much thankful to you and to your team for providing such a valuable place where students and teachers can learn. I personally learn a lot from your lectures especially in Geography, Geo morphology and statistics. I would like to thank you again for your hard working, life is unpredictable so I feel to say thanks.
Regards Imran Ahmed Khan

[NamruthaKodekanti]

Thank you for your explanation mam and explanation of our past and social political life please please mam

[Nanakclassesenglish]

Thanku ma'am, It was very helpful for me in lock down 😊

[jasminesingha]

thank you mam for the lecture.. your question related to pressure changes beneath the ocean is a nice question, so basically I am an open water diver, and discovered a concept that that pressure changes more rapidly the closer a diver is to the surface. As we all know that pressure increases with depth, more deeper we dive more pressure exerts from the body. Air in a diver's body air spaces and dive gear will compress as pressure increases (and expand as pressure decreases). Air compresses according to Boyle's Law. As pressure changes, we can feel inside the body functions, so to balance the overall thingy, we must equalize, make balance in the body. If we are unable to maintain or balance the pressure then our Lungs mainly might get collapse. The tissues of the diver's body causes to absorb more nitrogen gas than they would normally contain at the surface during increase in pressure, If a diver ascends slowly, this nitrogen gas expands bit by bit and the excess nitrogen is safely eliminated from the divers tissues and blood and released from his body when he exhales. If the diver's haphazardly tries to dive or ascend faster then the nitrogen will expand and will not be able to eliminate from the tissue, and ultimately it will start to form bubbles in the tissue and blood stream. the presence of these nitrogen bubbles might cause Decompression Sickness (DCS), by blocking blood flow to various parts of the body, causing strokes, paralysis, and other life threatening problems.

[tusharv]

very nice explanation but
oxygen is 21%
0:46

[farhananajeeb]

Mam, your explanation is very good. I understood everything you taught.

[crazyqueen]

Name:tehzeeb
Class:7th
Roll no:05
Sec:A

[dr.ruchikajoshi]

Ma'am the video is very informative Thank you very much

[ganeshpatil]

Teacher you explained very nicely thnx teacher 😍👍🏻👍🏻

[anuradhamalladi]

Mam very good explanation. I have understood all the topics ☺

[sunitasahu]

Thank u ma'am
I understood the whole chapter

[praveen]

Your video help me so much for my upcoming online exam

[PoonamSharma-ujfz]

Very nyc teaching. It helps me and I hope it will help others bcoz she is explaining very nyc and best . Thank you so much and maam plz come up with more interesting chapters. I will wait for more.Once again thank you so so so much....🤝🤝🤝

[yaminimeshram]

Mam as everyone know that during lockdown online classes are started an it's difficult to understand in classes but when you explain its very understanding for us thank you ☺️😊

[JayaLakshmi-svul]

Mam which I thought us is helpful in me exams.. thank you mam

[aju]

Hi, ma'am the question put forward by you regarding the human body in deep ocean is answered .
Deep beneath the ocean pressure is high and water fills any air gap left out, as nitrogen dissolves easily in water and air is mostly made of nitrogen. the pressure n filling of air gap forces water into mouth and fills the lungs and so lungs collapse or that our body suffocates when nitrogen dissolves.

[ramsharan]

Ma'am ur explanation is very well, that after taking help from ur video i have no doubts of that particular topic....

[OPDalmia]

Amazing video helping alot in preparing for exams

[bundelafebricsramgarhshekh]

please make video of light for class 7 in science