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This Is Why It's Always So Cold On Planes

And you have to cover every inch of your body in blanket.
PHOTO: MARKUS SPIERING / EYEEM / GETTY IMAGES
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Flying can be quite a traumatic affair. You have to avoid the water, keep your shoes on all the time, never eat the food and learn how to write with your left hand to distract yourself from the turbulence. It even sounds exhausting, doesn't it?

And that's before we even talk about the temperature. When you're in the waiting room, it can feel boiling. When you're waiting on the plane to take off: Still boiling. Even when you're 20 minutes into your flight: you probably feel hot.

And THEN? What happens mid-flight? The whole cabin descends into freezing cold temperatures, and you're desperately reaching for an extra sweatshirt and airplane blanket. But why?

There are actually a number of reasons airlines could choose to keep the temperature of your flight so low.

To look after equipment

Monserrat Andujar-Geacoman, a flight attendant for a domestic US airline, told Insider that aircraft were kept cool to "accommodate emergency equipment and cockpit instruments." She advised bringing an extra sweater.

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To stop passengers fainting

Metro dug out an old study by ASTM International which looked at why passengers faint mid-flight. The study found that hypoxia, a "deficiency in the amount of oxygen reaching the tissues" was more likely to occur during a flight than while on the ground because of the pressure inside the cabin. And hypoxia can often lead to fainting.

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Another trigger for hypoxia is warmer cabin temperatures, so airlines choose to keep the cabins cool to lower the risk of anyone passing out.

To keep the cabin pleasant

In a report commissioned by the House of Lords, Airbus explained that passenger body heat is quite substantial, so good ventilation is necessary for a fresh atmosphere. "The heat given off by passengers in a fully occupied cabin is considerable," they commented. "Incoming air needs to be at or below the required cabin temperature if that temperature is to be maintained".

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So next time you're moaning about the cold air, bear in mind the reasons behind it.

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This article originally appeared on Cosmopolitan.com/uk. Minor edits have been made by the Cosmo.ph editors.