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不私聊

[Aakash Gupta @aakashgupta]

That rooftop rain is just sweat, scaled up to a skyline, and the physics is the entire reason it works.

Water needs energy to become vapor, and a lot of it. Evaporating a single gram pulls about 2,260 joules of heat out of whatever it touches, which is why stepping out of a pool into a breeze makes you shiver in the middle of summer. The mist rig does that to a whole block of air at once.

The atomizing is the trick. Break one milliliter of water, about a fifth of a teaspoon, into 10-micron droplets and you get close to two billion of them, carrying more than a thousand times the surface area of the drop you started with. Evaporation only happens at the surface, so a thousand times more surface means the water flashes to vapor almost instantly and rips heat from the air before it ever reaches the ground.

Run the numbers and it barely spends any water. Cooling a cubic meter of hot air by 8°C means removing roughly 9.6 kilojoules. That works out to four grams of evaporated water. Less than a teaspoon drops a cubic meter by eight degrees, so one rooftop tank can chill a courtyard.

One condition decides whether any of this happens: the air has to be dry. Evaporative cooling depends on the surrounding air being thirsty enough to accept more vapor. Shanxi sits in China's dry continental interior, so the air drinks the mist and the temperature falls. Run the identical setup in Guangzhou or Miami and it does almost nothing, because saturated air has nowhere left to put the water.

Same reason a swamp cooler chills a Phoenix garage for pennies while a Houston one just makes it muggy. Same misters over Arizona restaurant patios. Same clay pot that keeps water cold in a village with no power line for miles.

The energy comparison is the kicker. An air conditioner has to pump heat uphill against the gradient with a compressor, which is why it eats electricity. This runs a water pump and lets a phase change do the work for a fraction of the watts. You pay in water instead of power, and only where the air is dry enough to take it.

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@elcapdoul 中国网络上，有人说你们哪儿安装空调很贵、手续很麻烦。是真的吗？

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@krishna1715 @sfgz_9_ @GiorgiaMeloni 9个有核国家没有批准这个条约，或是这个条约的签署国。

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@GaryJohnst14370 @KevinCastley 60层楼没电梯自来水，卖给你，你会买吗？

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@Nina_Mahsati 看来全世界的女权话术都是统一的，中国社交媒体和x是一样的。

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@aldskule @XueJia24682 每年全国统一高考，在分数公布后，每个考生填写一个志愿表，然后高校根据志愿表从高到低录取学生，直到计划招生人数截止。
去的学校和专业是考生和高校双向选择的结果。
因为制度的不同，可能你很难理解上面我说的内容。

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@grok @schwebelaustin @jpnexpert @XueJia24682 不同省份的试卷不同，不能只比较分数。

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@German07091 @cglassey_author 如果不敢说"真相"，可以选择沉默，而不是说相反的话。

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@TripInChina @americanmcgee @DanielDumbrill 最近很少登录x，今天发现有了这个新功能。

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@letteray @chenpapro 会不会是背后那个男人的智商。

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@JiaweiShen2568 你只放第二张图片，猜到原因的人数就少了。

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@flcjbtc 嫡长子这句话从何而来，美国允许纳妾吗？

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@L33Ghost @SagittariusWl @elonmusk Musk deliberately closed one eye in the photo with Lei Jun, because opening both eyes would let Lei Jun use face ID to take out 'wangdai' (risky online loans) under Musk's name. Classic Chinese dark humor!

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@L33Ghost @SagittariusWl @elonmusk This is a funny Chinese internet meme. When Lei Jun (founder of Xiaomi) took a selfie with Elon Musk, Musk winked and closed one eye. Chinese netizens joked that Musk was 'turning a blind eye' on purpose — because if he opened both eyes, Lei Jun could use the clear

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@L33Ghost @SagittariusWl @elonmusk facial photo to apply for online loans (wangdai) in Musk's name using face recognition!
It's playing on the idiom 'zhēng yī zhī yǎn, bì yī zhī yǎn' (turn a blind eye / pretend not to see). Musk is 'smart' for only giving half his face!"

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@jike112_jike 饮品中有水银的事，隔几年就来一出，没有一例是真的。这个人，头铁，非要挑战一下。

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@mako_63 疲劳驾驶违法，看来你比较喜欢接收罚单，而不愿意接收提醒。

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@sukie234 又学到知识了。

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@wjf110 如果对方回“我什么时候借过你的钱？”，如何破解。

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@JewBizLogic 能够快速大量流通的信息多数是垃圾信息。