The best material for thermos Essay
The best material for thermos, 498 words essay example
According web "Media Belajar", Flasks made of a mixture of aluminium, glass, plastic, and cork. The inside of the flask is made of aluminium-coated glass. This material is a good conductor. The outside of the flask is made of plastic and cork. The goal is to keep the temperature in a thermos to keep it. Cork and plastic are insulators of heat. There is also a vacuum using a vacuum therein, the vacuum also serves as a heat insulator. Vacuum sealed vacuum to maintain the water temperature. The principle of a thermos of hot and cold is similar
According Robert Colles(2014), the best material for thermos is better insulator material. For example metal. Metal have high thermal conductor but Styrofoam also better on for make thermos. Styrofoam is cheap and easy to shape but it poor thermal conductor. The example of Styrofoam thermos is fish boxes. Most thermos aren't just made out of a thermal insulating material though. The insulating material is often surrounded by another material for added rigidity or support. Such examples are metal, plastic, or cardboard.
The best material for thermos is can prevent heat transfer is use a vacuum. Manufacturers of thermoses will incorporate an evacuated air chamber in their thermoses. Since there is no matter in a vacuum, heat transfer cannot be conducted by conduction or convection. Radiation heat transfer still occurs though, but most vacuum liners are silvered so that radiation can be reflected. So a vacuum sounds like the perfect material to use, but why does the substance still cool down or warm up over time? This is because the vacuums are not perfect and the lids on thermoses aren't vacuum insulated. The lid of a vacuum insulated thermos is the area of largest heat flow.
Thermos section According web "Mindtalk" each part of thermos have a specific function like Close the flasks Stoppers as prevent heat transfer by conduction. Next, in "Glass Wall" as prevents heat transfer from the hot water that is not absorbed by the walls. "External walls Glass" is to prevent heat transfer by radiation. "Space Vacuum (Vacuum)" limiting the possibility of heat lost from or into the flask to convection and wall cover page as an insulator between the glass tubes with the surrounding air. "Rubber backing page" is to maintain position bottle (glass) remain in place and flasks made of double-walled glass, the wall is made of vacuum and one of the walls are lined by a layer of silver in order to heat the hot water is not absorbed by the walls and to prevent heat transfer by radiation.
Way of work Heat to be reflected back out to keep it out of the flask. While the centre is made with vacuum so that it will minimize the possibility of conduction and convection. Since there is no medium in the vacuum of space, the event that had been used by people to make and keep the water in a thermos flask to keep it hot.