Take a trip in the winter, cross-country skiing or when working outside, drink hot tea to warm up is really pleasant. Such comfort can enjoy each a thermos with a good quality, you can just choose the right. Thermos is an excellent helper, which you’ll appreciate not only in these cold days.
The history of the unit goes back to the year 1892 when Scottish chemist James Dewar invented the glass container with double walls, among which siphoned off air and aperture stop Fogg. Found it thanks to the vacuum will prevent heat loss. The inside of the containers had additional silver plated surface, thereby limiting the escape of cold radiation. The invention has earned the name of the Dewarova-container was created the first prototype of the unit in the world. The inventor, of course, had no intention to make a thermos for tourists, but to invent something, what could keep liquefied gases.
The concept of vacuum, has not changed much since then, still a double container, where it is ‘ taxed away ‘ between the walls of the air. Nevertheless, have endured a stormy development of thermos, what is th e design and durability. Already gone are days when they were impractical glass thermos, which often are for single use only. Their low life lay in the fact that the glass panel stand to save in your backpack, or a little rougher treatment. And God forbid that you fell down on the ground, you can give the site a tea just glass grit.
Currently, there is already an integral part of the equipment vacuum flask of tourists, who are issued in the winter in the mountain areas. The bottle is used primarily to hold hot liquids, which can withstand hot for hours, but it finds even in the summer months, when you can keep in it’s refreshing iced drinks. Thermos consist of inner and outer shell. Heat loss prevents vacuum layer between them and also polished layer or vacuum it’s made of metals such as aluminium.
Today, you can encounter in stores large amounts of vacuum, termohrnků and other thermal containers, before purchasing, you should understand, for what purpose you want to use. From the classical termohrnku without lids you can’t expect to keep tea warm longer than half an hour. You have the choice of containers of different sizes, materials and volumes.
In addition to the thermal insulation properties of the vacuum goes through the development of their design. The best is to have a thermos flask with a lid that can be simultaneously used as a Cup. The most important thing is that the well cap seal thermos. A good vychytávkou is, for example, the internal fuse on the closure, which is almost on all products. Slightly from the fuse and you can easily pour the drink without having to unscrew the CAP. For example, it is annoying when you have gloves. Some thermoses are also packaged in a leather Holster, which are easily portable and better protected from bumps and scrapes. Others are in turn supplemented by tapes and bands, thanks to which you can attach to the waist in a thermos bottle or backpack.
Great popularity is enjoyed all-metal vacuum thermos flask, which is also the most sold. Not only are they due to the walls of a thin steel unbreakable, but can keep the liquid warm (or cold) after considerable time—on average, 12 to 16 hours, then even the highest quality for more than 24 hours. All of course depends on the outdoor temperature. This type of vacuum has a good ratio of weight and volume, therefore they are ideal for multi-day trips or long term in nature.
On the Czech market, you will meet with vacuum flasks companies Coleman, Salewa, Tescoma, Sigg, Laken and other brands. In terms of volume, usually you will discover on the shelves of the unit to around ¾ litre up to 1 liter, but the exception is neither larger or smaller models. To the wealthiest individuals are probably kegs Coleman with a volume up to 3.7 litres. Stainless steel thermos you purchase from 10 €, you better then around 500 to 800 dollars.
In the market you will meet also with plastic vacuum flasks, which are also shatterproof, but their disadvantage is their worse compared to termoskám metal insulation properties. Indeed, isolation provides a layer of plastic or foam plastic products. As a rule, they can keep the temperature of the drink for 6 to 8 hours. Worse thermal properties are exported much lower price. Plastic thermos can therefore recommend it more for day trips and undemanding hiking. The best-known supplier of plastic coolers is a company Campingaz. Plastic thermos to get 200 crowns.
Whether you have a thermos of any material, please note that it also needs some maintenance. Never leave the vacuum flask fluid residues, thoroughly rinse it after use, rinse and allow to dry. Otherwise you might find that it would smell unpleasantly, thermos started could it create a mold or other bacteria. Maintenance of the unit doesn’t take much time and your care will certainly pay off.
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