Snowboarding jackets

Written by Jakob Jelling


Winter jackets have changed a lot overrepparttar years as technology has improved. The best solution used to be those big, puffy, down filled jackets. While they where warm they really didn't stand up all that well to wear and tears, moisture or active movements. Once again technology has come to our aid withrepparttar 132948 invention of new materials.

The new materials available have resulted in jackets that are warmer even when wet, lighter, more compact, tear resistant and fashionable. The most important area of improvement isrepparttar 132949 functionality of these new products. The main areas of improvement are in waterproofing, wind proofing and breathe ability.

Waterproofing is perhapsrepparttar 132950 most obvious idea and potentiallyrepparttar 132951 most important as well and is linked to your jackets ability to breath. Your body heat will be drained off very quickly if your clothing is wet make you cold much faster. Waterproofing has moved way beyond a simple chemical coating. Now it is atrepparttar 132952 point where there is a standard for waterproofing that is measured by how many centimeters of water can rest on top ofrepparttar 132953 material before leaking through. The best fabrics can support tens of meters of water before leaking!

Waterproofing is more than justrepparttar 132954 type of fabric used sincerepparttar 132955 final product is only as strong as its weakest link. What good is a waterproof jacket of water can pour throughrepparttar 132956 zipper? A good quality waterproof jacket will have many extra features built into it that may not be visible. For example a jacket should have all of its seams sealed with a waterproof tape,repparttar 132957 zipper should be covered,repparttar 132958 inner layer must not absorb water andrepparttar 132959 entire jacket should be made of waterproof materials not matter whatrepparttar 132960 section is.

The next area to consider is wind proofing. Wind proofing is almost becoming a thing of that past. Of courserepparttar 132961 wind will greatly effect how fast you loose body heat but is a non-issue if your jacket is highly waterproof. A jacket that can with stand a column of water tens of meters high is wind proof. The only time wind proofing is an issue is if your jacket is either entirely fleece or not fully waterproof.

The skin squeeze effect in diving

Written by Jakob Jelling


Skin squeeze is one ofrepparttar barotrauma problems which divers can suffer due torepparttar 132947 pressure factors involved inrepparttar 132948 practice ofrepparttar 132949 sport. This way, a barotrauma can be caused due torepparttar 132950 differences betweenrepparttar 132951 pressure ofrepparttar 132952 water andrepparttar 132953 surface pressure to whichrepparttar 132954 diver's body is adequate and used to. Barotraumas include problems such as external, inner and middle ear squeeze, eye squeeze, skin squeeze, sinus squeeze and lung squeeze.

While being intorepparttar 132955 water, a diver is in a heavier environment than when he is inrepparttar 132956 surface due torepparttar 132957 fact that water is a denser medium than air. The relationship betweenrepparttar 132958 density ofrepparttar 132959 environment, its pressure andrepparttar 132960 way it affectsrepparttar 132961 human body are explained through several physic laws, among which we can specifically find Boyle's law, Dalton's law and Henry's law.

These physic laws explain that there is a constant relationship amongrepparttar 132962 volume andrepparttar 132963 pressure multiplication. This way, it explains thatrepparttar 132964 way in whichrepparttar 132965 deeper a diver goes intorepparttar 132966 water,repparttar 132967 more pressure he will be exposed to. Therefore, whenever they wish to go deep intorepparttar 132968 water, divers should have this law in mind and takerepparttar 132969 precautions necessary to avoidrepparttar 132970 effects which this pressure increase can have on them.

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