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风从哪里来

Where does Wind come from? | #aumsum

It’s AumSum Time.
这是奥萨小课堂
Where does Wind come from?
风从哪里来呢
Like me.
像我一样
It comes from Wonderland.
来自仙境
Oh AumSum.
喔 奥萨
Wind can be defined as the movement of air molecules on a large scale.
风可以定义为空气分子的大规模移动
Sun is primarily responsible for the creation of wind.
太阳是产生风的主要因素
How?
具体是怎样的呢
Sun’s rays heat up the Earth’s surface everyday, but they do so unevenly.
太阳光每天不均匀地加热地球表面
Air present above land heats up much faster as compared to.
与水体上方的空气相比
Air present above the surface of rivers and oceans.
陆地上方的空气升温更快
This results in the creation of different air pressures.
而温差产生了压强差
The heated air above land expands and rises up.
地面的空气遇热膨胀上升
The cooler air from the oceans rushes in and takes its place.
海洋上方冷空气流入并占据了近地面空间
Resulting in a sea breeze.
从而形成了海风
Now, at night, inland temperatures drop.
到了晚上 内陆温度下降
Making oceans relatively warmer than land.
海洋相对陆地就更为暖和
Hence air above oceans expands and rises up.
因此海上的空气就会受热膨胀上升
The cooler air from land rushes in to take its place.
陆上的冷空气便流入并占据近地面空间
Resulting in a land breeze.
从而形成了陆风
In this way, wind is born.
风就是这样形成的
What if wind suddenly stop?
如果风突然停下了呢
wind might stop
风可能会停止
but Aumsum the great will never stop
但意志坚强的Aumsum不会停止
Stop it, Aumsum!
停下 Aumsum
Firstly, if there was no wind in heavily industrialized places
首先 如果重工业地区没有风
Pollutants vwould not disperse
污染物就不会消散
Making the air extremely toxic
空气中就不会充斥着有毒物质
Secondly, the equator would get more hotter
其次 赤道会变得越来越热
While poles would get more cooler
而两极会变得越来越冷
Why?
这是为什么呢?
Because in the absence of winds heat at the equator
因为在没有风的情况下
would not be carried to the poles
赤道的热量无法到达极地
Thirdly, kite and sailing ship enthusiasts would be extremely unhappy
第三 风筝和帆船爱好者会特别难过
As kite would suddenly fall down and sailing ships with suddenly halt
因为风筝会突然掉下来 帆船会突然停下
Fourthly, birds would be very sad
第四 鸟儿会非常伤心
As they they were not be any free lifting anymore
因为它们再也无法迎风翱翔了
They will have to flap their wings all the time
它们必须不停挥动翅膀飞翔
Fifthly, as winds are majoy sources of pollination
第五 没有风植物会遭殃
Without winds, plant life would greatly suffer
因为风是它们授粉的主要途径
Sixly, wind energy companies would not be happy with this sudden change
第六 风能公司也不会为这个变化感到开心
One plus point of winds stopping suddenly
但风突然停止还是有一点好处
is that there won’t be tornadoes and hurricanes
那就是不会再有龙卷风和飓风
How dose a fan give us cool air?
风扇是怎么吹出冷风的呢?
Cause there has a refrigerator insiding it
因为风扇里有一个冰箱
Ah, you’re just unbelievable
啊 你可真让人难以置信
First of all, a fan does not give cooler air
首先 风扇不会吹出冷空气
Our body loses heat may in two ways
我们的身体可能通过两种方式散热
Firstly, our body heat gets transfer to the surrounding air
第一 身体热量通过对流
through a process of convection
转移到周围的空气里
Secondly, the sweat produced on our skin
第二 我们皮肤产生的汗水
absorbs that our body heat and evaporate to the air
吸收了身体的热量 随后蒸发到空气里
That’s allowing us to lose heat
于是我们可以散热
Now, without a fan
没有打开风扇的时候
All of these above waits to need stagnant layer
我们皮肤周围的湿热空气会形成滞留层
of hot humid air around our skin
这些散热方法就不管用了
That’s make it difficult to continue the processes of convection and evaporation
因为对流和蒸发都很难进行
However, when we switch on the fan
然而 当我们打开风扇
it blows away the stagnant layer of hot air
风会把滞留的热空气吹走
And replaces it with a relatively drier air
带来相对干燥的空气
Allowing the processes to continue and
从而让散热过程得以进行
thus we lose more heat and cool down faster
我们就可以迅速凉快下来
Why does hot air balloon float?
热气球为什么会飘起来呢
Cause it has invisible winds
因为有不可见的风
No, it is because of density
不 这是因为密度差异
Density is the meassure of mass present per unit volume
密度是对单位体积内质量的度量
Less than the density, later would be the object
低于一定密度 热气球就能飘起来
Now, density varies with temperature
不过 密度会随着温度而变化
Oh, dude, it is so comolicated
喔 兄弟 这太复杂了
All right, I’ll explain it
没关系 我解释给你听
When a hot air balloon is on ground
当一个热气球在地上
The air inside and outside the balloon is
气球里面和外面的空气
of the same temperature and density
有相同的温度和密度
However, when we turn on the burner of the balloon
但是 当我们打开热气球里的热源
The air inside the balloon starts getting hot
球内的空气开始升温
The molecules of air move faster and spread apart
空气分子快速移动并四处散开
taking up more space
占据了更多的空间
Hence the air inside the balloon become less dense than the air outside
因此相比外部的空气
than the air outside
球内的空气密度更小
As less dense the air is lighter
随着密度变小 空气会变轻
the hot balloon rises and thus begins to float
热气球就会升起然后开始漂浮
topic the rain
主题 雨
Why does rain smell?
雨为什么会有气味
Maybe it applies special perfume
也许它喷了特殊的香水
Rain is just water and water doesn’t have any smell
雨就是水 水是没有气味的
Yeah? Dude, so what’s that smell
是吗 兄弟 那到底是什么
The distinctive smell which frequently accompanies the first rain
独特的气味通常伴随着
the first rain after a dry weather
干燥天气后的第一场雨出现
is scientifically called petrichor
它的学名叫潮土油
It basically comes from plants and bacteria clled Actinomycetes
它基本上来源于植物和一种生活在土壤里的细菌
which live in the soil
叫做放线菌
Now during a long dry spell
长时间的干旱之后
The plants release oils into the soil to block other seeds from germinating
植物向土壤中释放油脂以阻止其他种子发芽
That’s reducing competition for water
从而减少对水的竞争
Whereas, the Actinomycetes produce a chemical
然而放线菌会产生一种化学物质
called geosmin
叫做土臭素
Now when rain hits the ground
在雨水落进地里时
It brings up the oils and geosmin which then mixed with air
会带出油脂和土臭素 后与空气混合
The combination of these geosmin along with the plant oil
土臭素和植物油脂的结合
Form the smell which we receive after the rain
就是下雨之后我们闻到的气味

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