Date Posted: 9/9/2012 11:14:04 AM
Posted By: Razen Membership Level: Gold Total Points: 3454
How a thermos flask keeps it hot or cold for up to 48 hours.Sometimes we wonder how the use of technology makes life easy. In this topic, I shall discuss how. A thermos flask is made/functions.A thermos flask, commonly known as thermos, functions through the fact that vacuums spaces do not allow heat to travel through it. Inside the metallic/plastic housing, a vogue contains a silver coated double-walled glass!The following are parts of a thermos flask.*the plastic housing. (The vogue)*the flask.*upper lid*the lower/bottom lid*upper/top rubber band*the bottom fitter.*two cups.Let's discuss the function of each component.*the plastic housing. (The vogue)This part holds in it all the parts of the flask. It contains a small upper threaded opening and the lower one. The top opening is used to allow fluids in or out of the flask. The bottom opening is large and is used when removing the flask for cleaning/maintenance or replacement. This part is made of plastic and hence cannot break easily as compared to the fragile flask inside. It has a firm handle that supports the weight of a filled flask. This part shields the flask against dirt, water, heat and shock. Its walls are well spaced from the outer wall of the flask and hence allow circulation of air.*the flask. This is the most important part of the vogue. It is made of double-walled glass. In between the walls, air is sucked out using a special machine to create a vacuum. Both walls' outer and inner surfaces are coated with silver to further reduce the conduction of heat. The smallest capacity of the flask recorded was about 200ml, with the largest holding over 5 liters. Once the vogue leaks, air blows in between the walls and thus conduction surface increases, reducing the number of hours the content in the flask stays hot or cold. The flask is held in place by two rubber/plastic bands. The bottom lid presses it hard to the top/bottom parts of the vogue. Note: the flask does not touch the walls of the vogue. The content of the flask is determined by the volume of it's inner flask. A rubber band holds it to the top in such a way that the lid perfectly fits into the opening. Air/heat can only pass through the opening if left partially/fully open.*the lids and the rubber bands are used to close the openings of both the vogue and the flask and hold the flask in place respectively.Uses of the flask.* the flask keeps liquid contents hot or cold for about 2 days. The content starts to heat up or cool off because the flask does not offer 100 percent functionality. Due to conduction, eventually the content cools/heats up.Advantages of using a flask as compared to other storage containers.*content stored in it does not adjust to the temperature of the surroundings. The heat/cold inside is stabilized for a given time.*if the flask is well cleaned, the content stored inside does not get contaminated.*the flask is portable because of the lid and the handle.Thermos flasks are sold in almost all supermarkets and large shops. The price ranges from 150 to 6000 depending on capacity and quality of materials used. Other factors influencing the price range include:*location*demand*manufacturers pricing*quality demand.If you ought to keep it hot or cold, don't waste fuel heating over and over again....go for a thermos flask.
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