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Weather and Climate
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In this lesson I have discussed about the difference between weather and climate and concepts like temperature,air pressure ,wind and moisture .

Arpita Prakash
NCERTs series initiator at Unacademy 'Educator of the Month' for Feb'19 CBSE 0.1% Merit Certificate holder in Mathematics

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(51)
U
Unacademy user
very helpfull video
To all those who are confused about whether pressure should increase or decrease with temperature: Normally, as temperature rises, the heat energy molecules increases making them move more rapidly. This causes those molecules to exert an increased pressure as they collide with objects around them. It would thus naturally follow that the higher you increase the temperature, the higher will be the pressure in a particular location.This is in accordance with Guy-Lussac's law. This, however, is not always the case. More often as the temperature increases, the atmospheric pressure actually decreases. This is because as the temperature rises, the atmosphere expands, becoming less dense (as per slide 9). Even though it is true that individual molecules are each exerting more pressure, the decrease in density is enough to create a lower pressure. Therefore, don't blindly apply PV = nRT without assessing the situation. Cheers!
Animesh Panda
10 months ago
yes! PV= nRT, though the simplest model is not completely perfect. I'll have to delve into thermodynamics to explain it properly. which is beyond our curriculum. but your explanation explains it well in nutshell.
Animesh Panda
10 months ago
yes! PV= nRT, though the simplest model is not completely perfect. I'll have to delve into thermodynamics to explain it properly. which is beyond our curriculum. but your explanation explains it well in nutshell.
Animesh Panda
10 months ago
yes! PV= nRT, though the simplest model is not completely perfect. I'll have to delve into thermodynamics to explain it properly. which is beyond our curriculum. but your explanation explains it well in nutshell.
major pressure belts and wind system plz explain again.. becoz pressure at poles is high not low
KG
Ma'am I have a query. You said with the increase of temperature, pressure decreases. But when we climb on the mountains, with the increase of height, temperature decreases and so pressure must increase. But you said with the increase of height, pressure decreases. It will be very generous of you if you will clarify my doubt :)
Srichakra Kotra
3 years ago
PV=nRT. In mountain case - both the temp and density(i.e 'n' no.of moles) of the air are decreasing so the pressure decreases.
KG
Khushbu Garg
3 years ago
thankyou :)
Shivam Singh
3 years ago
temperature is directly proportional to the pressure.... and so that whenever temperature increase pressure decrease and vice- versa ....
Shivam Singh
3 years ago
sorry temperature is inversely proportional to the pressure.... and so that it happens...
Bhupesh Bisen
2 years ago
the concept of temperature and pressure is that ...when we are in earth surface if temperature increases​ then pressure decrease because air particle move upward which creates low pressure ...while in case of mountain when we go upward the temperature decreases because there is less air particle and hence less collision of particle which results in less heat ... while the sun rays in mountain are very strong but the temperature is very low
Mam,Pressure decreases as temperature increases. Temperate zones are less warmer than Torrid zones,then why does high pressure exist in the Horse belt and Polar regions? The other factors are more dominating here?
Imran Ahmed
2 years ago
coz in horse latitudes and polar region winds decends ( refer walker cells and headly cells)
mam... u hv told about the factors affecting the atm pressure... so in the temperature factor... can u tell me.. how the low pressure ares have cloudy sky and high pressure ones with clear sky???
Arpita Prakash
3 years ago
https://www.americangeosciences.org/education/k5geosource/content/weather/why-is-the-weather-different-in-high-and-low-pressure-areas
Arpita Prakash
3 years ago
Please check this... might clear your doubt
yes mam... got it!! thanq.. :-)
Neelam Jassal
a year ago
how can i open this link
Neelam Jassal
a year ago
how can i open this link
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