The human body starts duke activestaffer to generate heat as soon as the ambient temperature drops

As soon as the ambient temperature drops below +28 C, the human body begins to lose heat. The lower the temperature falls, the more intense the heat loss, especially if the body is not protected by clothing.
From school physics course, we know that there are three ways of heat transfer: radiation, convection and conduction. Why devote a separate evaporation and breathing? Because the actions to eliminate heat loss through evaporation and breathing a little different from the rest.
Rather, duke activestaffer breathing nothing we can do. Well, you can stop breathing, but then after five minutes we will begin to cool by more annoying reason. One lucky that breathing we lose comparatively much heat, if it is not a strong frosts. But in cold weather, heat loss vospolnimy breathing easily.
We turn to the radiation. Any object that is heated duke activestaffer above ambient temperature radiates heat. Everyone felt it sitting by the fire. Bonfire radiates warmth and heats the objects around. duke activestaffer When this fire loses its heat.
The human body starts duke activestaffer to generate heat as soon as the ambient temperature drops lower than the temperature of the skin surface. To prevent loss of heat by radiation, it is necessary to protect the exposed areas of the body. Thus, we will create a layer of air between the skin with clothes and the environment. The temperature of this layer is equal to body temperature and heat loss by radiation to decrease. Why not stop the loss of heat at all? Because now heated clothing will radiate heat, losing it. And even putting themselves one more layer of clothing, you do not stop radiation. But I have another good news. Heat loss by radiation is not too dominant.
This is not true for convection. Convection duke activestaffer heat losses are quite large and they need to be able to eliminate. The essence of the convection process is as follows: our body warms the air near the skin becomes heated air is lighter duke activestaffer than cold and rises upwards, duke activestaffer and he is replaced by cold air that is reheated, it becomes easier and the next portion is displaced cold. If you do not seize the heated air through clothing, then this process will be infinite.
When the wind blows, the situation worsens. Wind carries huge portions unheated air. Even when we put on a warm jacket, the wind does not cost anything to expel warm air out of it. The same thing happens when we move. Our body "bumps" in the air, and it flows around duke activestaffer us, acting like the wind. It also multiplies the heat loss.
What is the solution? Wear windproof coat: windproof jacket and pants. Do not forget about protecting the head and neck. Due to the active circulation duke activestaffer of the brain, neck and head - the most heated areas of the body, so the loss of heat from them is very large. Also, in cold weather should avoid places like blown while driving, and when choosing a place to stay overnight. Easily blown open fields and mountain ranges.
Loss of heat conduction occurs when direct contact with a cold object. At this point, our body gives up its heat. The rate of heat loss is strongly dependent on the thermal conductivity of the object, which we touch. For example, stone conductivity is 10 times higher than the timber. So, sitting on a stone, we will lose heat much faster. You probably noticed that sit on the stone somehow colder than not log.
Solution? Insulate your body from cold items using bad conductors of heat. Simply put, settling for a rest, take a camping mat or bundle of clothes. At night, be sure to place them under a sleeping bag camping mat, appropriate weather conditions. Or, in extreme cases, a thick layer of dry grass or pine needles. Land is a good conductor (and thus "selects") heat and cools at night.
In winter, do not take metal objects with your bare hands. Use gloves. Metal thermos can wrap the plaster. In severe cold metal objects can receive local frostbite. Be careful.
From our list have only evaporation. Evaporation occurs when skin or clothing appears moisture. This happens either when we get wet in the rain, or when we start to sweat. Moisture is warmed by body heat and begins to evaporate, taking with it the heat.
Reduce heat loss from evaporation will help control the selection of clothing. Clothing should be selected based on the weather conditions and the current activity. Do not be lazy to remove excess clothing when growing load. You will sweat less. And do not be lazy to wear it again when the load stops. Remove moisture and wind protection, if the rain with no wind, otherwise the clothes will get wet from the inside, from your sweat. A contact with the wet clothes, duke activestaffer we lose more heat and thermal conductivity. duke activestaffer Water in the air 25 times better heat conductor. So, in wet clothes, we lose heat 25 times faster. That is why it is important to keep clothes dry.

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