What would happen if that airplane door opened?

「艙門打開的話會發生什麼事？」

Commercial airplanes pressurize their cabins to match the atmospheric pressure of 8,000 to 10,000 feet above sea level,

商業客機將艙內增壓以配合海拔 8,000 到 10,000 英尺的大氣壓

even though the cruising altitude of the plane you're in is 30,000 to 45,000 feet in the air.

儘管你乘坐的飛機飛行高度約 30,000 到 45,000 英尺

As altitude increases, atmospheric pressure decreases.

隨著高度增加，大氣壓就會減少

This is due to Earth's gravitational pull on the air molecules in the atmosphere.

這是因為地球對於大氣中的空氣分子地吸引力的關係

The closer to the Earth's surface the stronger the force exerted on these molecules.

越接近地球表面，這些分子便會承受越強的壓力

If the door were opened the plane would depressurize in less than 0.5 seconds.

假設艙門開了，飛機會在少於 0.5 秒內減壓

Unless your seat belt is fastened you and any loose objects would immediately be ejected due to the difference in pressure.

除非你有繫上安全帶，否則你或是任何鬆散的物體都會馬上因氣壓的變化而被拋出

During such a scenario survival rates are very slim given the possibility of the entire plane breaking apart.

在這種情況下，生存機率渺茫，整架飛機有可能會分裂

Because the air is substantially thinner at high altitudes there is substantially less oxygen.

因為高空中的空氣大幅度變稀薄，氧氣也大幅度減少

A gradual decompression in the cabin will cause the oxygen mask to drop from above

客艙內逐漸減壓會導致氧氣罩從上方掉落

and on average you have 18 seconds to put the mask on before hypoxia kicks in.

在缺氧前，你平均有 18 秒的時間帶上面罩

Hypoxia occurs when oxygen levels decrease, causing symptoms of nausea, dizziness and unconsciousness leading to death.

缺氧是在氧氣水平降低時產生，引發的症狀有噁心、暈眩和昏迷致死

The oxygen reserves on the plane would last for only 10 minutes.

飛機上儲備的氧氣僅能維持 10 分鐘

Enough for the pilot to descend rapidly to 8,000 to 10,000 feet

足以讓機長能迅速的降到 8,000 至 10,000 英尺

to match both the internal and external pressures and give you hope for survival.

機內與機外的氣壓能夠接近，讓你保有生還的機會

Freaked out yet?

嚇到了沒？

Don't worry, the chances of the door opening are so small

別擔心，艙門打開的機率非常小

because there's eight to ten pounds of pressure exerted on every square inch of the plane.

因為飛機的每平方英吋都會施上 8 到 10 磅的壓力

Remember there's more pressure inside the cabin than outside.

記得機艙內的氣壓比機艙外還要高

Using the largest commercial airplane the Airbus A380 as an example,

以最大的商業客機 Airbus A380 為例，

the main door measures 4288 square inches,

主要艙門的大小有 4,288 平方英吋

meaning a 38,592 pounds of force would be required to even begin to open it.

也就是說需要 38,592 磅的力道才能試圖將它打開

To compare this would be equivalent of you trying to move 3 African bush elephants -

做為比較，這相當於你試圖移動 3 隻非洲草原象 －

the largest land mammals on earth.

地球上最大的陸地哺乳類動物

Additionally, plane doors are almost always electronically locked by the pilot

除此之外， 飛機門幾乎都必須由機長電子操作

through functions accessible only from inside the cockpit.

透過僅有駕駛艙才能接觸到的功能來鎖上

And to ease your worries more:

再讓你放心點，

It would also be nearly impossible for someone to punch and break through an airplane window.

人們要敲破飛機的窗戶幾乎是不可能的事

These windows can also be made with up to six layers of various types of strong polymers and are bulletproof.

這些窗戶可由多達六層各類強力聚合物所製成並具有防彈功能

Furthermore, these windows are almost always rounded to decrease drag while in flight,

況且這些窗戶幾乎都是圓弧形，可減少飛行中的阻力

thereby preventing cracks and decompression.

也能防止破裂和擠壓

You're more likely to die in a car than during aviation with a 1/114 chance of car accidents compared to 1/9821 for air travel related accidents.

相較於車禍 1/114 的機率，航空飛行相關的意外機率僅 1/9821，也就是說在行車中喪命的機率遠高於飛行事故

So fasten your seat belts, pay attention to your safety videos, and above all enjoy the flight.

那麼就係好安全帶，注意安全影片，最重要的是要享受這段旅程

Thank you so much for watching! Make sure you subscribe,

非常感謝你們觀賞！一定要訂閱哦

because we make new science videos every Thursday.

因為我們每個星期四都會製作新的科學影片

And click the bell because apparently it does something.

別忘了點擊鈴鐺因為它顯然有些作用

If you want to watch more right now, we'll link a couple videos over here that you can check out

如果你還想要看，我們會在這放幾段影片的連結

to satisfy your science needs,

滿足你科學方面的求知慾

Otherwise we'll see you next Thursday for a new video.

不然的話我們就下星期四新的影片再見

Peace!

先閃了！