Psykopatologia kirjoitti:Perun aiemman. Kyllä mikrosortsit sittenkin ovat parhaat vähän viileämmälläkin.
trisse kirjoitti:Pinja kirjoitti:Tarkoititko trisse käsituuletinta vai tuuletinta kotiin?
Mikä ero niillä on?
With this in mind, have you ever noticed that the traditional garb in desert countries is not the bikini? Loose, light (in both colour and weight), long-sleeved shirts will keep you cooler than T-shirts. And, in most climatic conditions, cooler than other short- (and non-) sleeved tops as well.
The broad issue of weather, clothing, and body temperature is quite complex, and difficult to completely characterize. But the basics are straightforward … the heat that your body is trying to get rid of arises from two sources: as a byproduct of metabolism, and heat transfer from the environment. You can reduce the former by simply slowing down; this is why the pace of life is more relaxed in regions where hot afternoons are the norm.
In very hot weather, though, most of the heat that your body is trying to eliminate has been absorbed from its surroundings. Light-coloured garments that cover your skin will dramatically curtail that absorption, greatly reducing the heat that must be dissipated.
Sweating is the body's natural cooling mechanism (so remember to keep well hydrated). The efficacy of the process is related to humidity, however, which can become high enough to block evaporation entirely; when this occurs, it doesn't matter whether your sleeves are long or short: the sweat will just lie there on your skin, and provide no cooling effect. On the other hand, sun damage (which can occur very quickly in the hot sun) significantly reduces the ability of the sweat glands to function correctly, thereby reducing the body's ability to regulate itself. And long sleeves definitely defend against this.
Sure, lots of people in New Orleans wear short-sleeved shirts; people often wear what they believe will keep them cooler, rather than what actually will. But I was in New Delhi, where the temperature was 115°F (46°C) when I first wrote these paragraphs, and the great majority of local residents were wearing long-sleeved clothing.
In order to promote the circulation of air necessary to the evaporation of perspiration, hot-weather clothing should additionally be both loose-fitting and porous (air-permeable). How porous?Original Function of the Umbrella Enough so that air can pass through it without serious restriction. Test it by making an "O" with your mouth about the size of a typical beverage bottle (1" / 2.5cm), and stretching a piece of the fabric over it. If you can breathe comfortably through your mouth (not your nose), the cloth is sufficiently porous for decent evaporation. If not, it isn’t.
All of this holds true for the lower part of your body as well. Long pants/skirts/dresses of an appropriate fabric will keep you cooler than shorts of any length.
A wide-brimmed hat is a convenient way to shield your head from the sun, but is not ideal. The headband, where the hat makes contact with your body, interferes with sweat production; worse, unless the hat features an open mesh design, the entrapped air space prevents proper evaporation.
The ideal way to protect your head (indeed, your upper body) from the sun is with an umbrella. Although most people from North America and the U.K. think of an umbrella as something to ward off rain, its original — and still most common worldwide — use is as a sun shade (umbrella, diminutive of umbra "shade, shadow"; i.e., "little shade"). Its origin is even more obvious in the word parasol (from para- "defence against" + sole "sun”).
Finally, a comment on hand fans. In modern times, these have largely been relegated to female use (such was not always the case). This is unfortunate, as a hand fan is a surprisingly effective way to create air flow — and thus evaporative cooling — with remarkably little effort. Many such fans are far too small to be of much practical use (you need a fairly large surface area to generate much effect), but bear this option in mind when looking for ways to beat the heat!
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