When it comes to marathons, what do you think are the essential items for running a marathon? Water, electrolyte drinks, energy supplements, large towels, clean clothes... In addition to these more conventional necessities, the editor decided to introduce a super powerful new friend - first aid blanket.

It is small in size and very easy to carry. When folded, it is only the size of a palm, and when unfolded, it becomes a silver film that can wrap your entire body. The life-saving blanket is plated with silver and gold aluminum foil on both sides, and it is very light in weight, about ten grams. It seems inconspicuous, but it is extremely powerful. In a low temperature environment, wearing it can keep 80 percent of its own heat from dissipating.

So, what is the principle of first aid blanket to keep warm? The first is to add a thermal layer to keep warm. The thermal insulation layer is generally some fluffy material, which uses the air mixed after the fluffy to form a non-flowing air layer on the surface of the object. The air itself is a poor conductor of heat, so it can play a certain role in keeping warm. General down and cotton use this method to keep warm. The aluminum film in the aluminum-plastic film of the emergency blanket uses this principle to ensure that a layer of air on the surface of the human body is stable and does not flow.

Then there is the heat reflective thermal insulation. Use highly reflective materials to reflect thermal radiation back. We all know that white clothes are cooler than black clothes because white is more reflective than black and can reflect sunlight back. The aluminum contained in the emergency blanket is a highly reflective material, which can reflect the heat radiation emitted by the human body back, and its heat reflection efficiency is as high as 90 percent . This effectively reduces the rate of heat dissipation of the human body.

Speaking of which, you may think that the first aid blanket is an essential tool for keeping warm when climbing snowy mountains. In fact, in general outdoor activities, one should also be prepared by hand, and it can be used to ask for help when necessary.

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