what is weather? energy is transferred between fast-moving molecules and slower-moving molecules –...
TRANSCRIPT
![Page 1: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/1.jpg)
What is Weather?
• Energy is transferred between fast-moving molecules and slower-moving molecules–CONDUCTION – transfer of energy when
molecules collide–CONVECTION – occurs when warm air rises
and cool air sinks; it’s the transfer of heat, usually in liquids or gases
![Page 2: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/2.jpg)
What is Weather?
• State of the atmosphere at a specific time and place• Includes such conditions as air pressure, wind,
temperature, and moisture in the air• Temperature is a measure of air molecule movement– Sun’s energy causes air molecules to move rapidly;
temperatures are high and it feels warm– When less of the Sun’s energy reaches air
molecules, they move less rapidly and it feels cold
![Page 3: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/3.jpg)
If we were to pick one term to help explain why we have weather, what do
you think would be a good word?
You might pick heat or sun….but another good
choice would be
Convection
![Page 4: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/4.jpg)
After the atmosphere is warmed by radiation and conduction, the
heat is transferred throughout the atmosphere by convection.
• Since warmed air has more space between the molecules, it’s less dense and rises
• Cooled air is more dense and tends to sink
• In general, air near the equator tends to rise and air near the poles tends to sink
![Page 5: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/5.jpg)
Take a look at this!
![Page 6: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/6.jpg)
Notice the band of clouds around the equator ?
This is the ITCZ or inter tropical convergence zone
![Page 7: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/7.jpg)
Why do you think there is this band of clouds near the equator?
![Page 8: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/8.jpg)
Did you figure it out?
• Warm, moist air in the tropics rises• Cold air can hold less moisture than warm
air• As the moist air rises, it condenses and
forms clouds!
![Page 9: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/9.jpg)
Now What?
• Ok, so we know that the weather moves around on these highways and that warm air rises and cold air sinks.
• But why is it sunny one day, and rainy the next?
![Page 10: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/10.jpg)
Let’s take another look at the weather map
• Notice that there are H’s and L’s on the map
• There are also blue lines with spikes and red lines with half circles
• Let’s take a closer look!
![Page 11: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/11.jpg)
AIR PRESSURE
• Air weight that varies over Earth’s surface–Warmer air is less dense and exerts
less pressure– Cooler air is more dense and exerts
more pressure
![Page 12: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/12.jpg)
High Pressure Areas
• When cooler air sinks and is warmed, the air can hold more moisture
• This usually means sunny skies
• Winds tend to move clockwise around a high
![Page 13: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/13.jpg)
Low Pressure Areas
• When warm air rises and is cooled, the air can not hold as much moisture
• Often, these areas are associated with precipitation and stormy weather
• Winds tend to move counter clockwise around the low
![Page 14: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/14.jpg)
So, if you see a big H on the weather map over the area you live, you can expect fair
weather
![Page 15: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/15.jpg)
When you see a big L in your area, there will probably be stormy weather
![Page 16: What is Weather? Energy is transferred between fast-moving molecules and slower-moving molecules – CONDUCTION – transfer of energy when molecules collide](https://reader035.vdocument.in/reader035/viewer/2022062404/55169816550346a25b8b51a8/html5/thumbnails/16.jpg)
These highs and lows move more or less along the jet stream and bring us our weather changes