The portable
sleeping bag is designed to protect you from the cold in a dream during
campaigns. But depending on how the bag is made, which materials were used
in its manufacture, the extent thought you will design a comfortable at these
temperatures producer or not.
Let's talk a
little about the physiology and heat transfer processes. Sleeping person
produces between 75 and 100 watts of heat. For the person of average body
type, this means that per square meter of body surface it falls between 47 and
55 W / m2 heat. The generated heat depends on the person of complex
metabolic processes, which are influenced by gender, human complexion, his
state of health and other factors. For example, a young, rather chubby man
produces more heat than the older male, and many more women. In addition,
beginning tourists feel cold longer inherent than experienced
travelers. Just as people often working outdoors, are less prone to
hypothermia than office workers. The general trend is that upon reaching
25 years people usually dense physique more cold-resistant than lean. Heat
losses are due to heat conduction surface and air circulation, including breathing.
As you know, the
more heat is generated during sleep, the man inside the sleeping bag
warmer. Less than or persons susceptible to cold, the more comfortable it will
be at lower temperatures. The task of the sleeping bag is to reduce the
heat loss due to heat conduction.
Unfortunately,
there is no universal sleeping bag that can be used in all conditions, so that
it was easy, take up little space and at the same time was low. The main
criterion for choosing a sleeping bag is its purpose, under what
conditions and at what temperatures you will use it.
By the way, if you
are going camping, a portable hanging light
and a lightweight waterproof tent
can also help you a lot.
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