व्हाई डस द लो प्रेशर रीजन ब्रिंग रेन एंड स्टोनव्हाई डस ए लो प्रेशर रीजन ब्रिंग रेन एंड स्टॉर्म
Answers
Explanation:
Why does low pressure bring wind and rain?
Solution :
A low pressure region is caused by air rising. When something is causing the air to rise in a region, that leaves a lack of air below it. That lack of air means the pressure is lower there than in the surrounding region, and that low pressure is what sucks air in from around it. That’s wind blowing in to replace the air that went up in the air.
One thing that can cause a region of air to rise is humidity. Water molecules are lighter than air molecules. The molar mass of H2O is 18 whereas for air, the molar mass is about 29. So when you have a lot of water molecules in the air (that is, it’s humid) the air is lighter than average. And lighter air is more buoyant. So it rises. As it rises it expands because the air pressure decreases as you go up in altitude. Expanding a gas cools it. Colder air cannot hold as much water vapor, so it starts to condense and form clouds. Eventually, the tiny water droplets in the clouds coalesce into rain drops. Those raindrops are cold because they form in that cold air up there. When they fall down, the carry some of that coldness back down with them.
So low pressure is associated with cold cloudy rainy weather.