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| Gbr. Thermos (Vacuum Bottle) or Flask |
A Brief History About Thermos or Vacuum Bottle Termos or also known as a vacuum bottlr was invented by Sir James Dewar. He worked as a lecturer at the Royal Veterinary College, cuman not teach doang loo, he also made some research. Well when he examines the electrical resistance accidentally discovered vacuum tubes used for shipping and storage of liquid gas.
But Dewar saw another opportunity of discovery. Then he developed the vacuum tube to a flask that is capable of maintaining the temperature, cold or hot.
According to the Theory of Exchange of Henry Prevost Babbage (1824 - 1918) that a cooler is always absorbs the heat waves from the object to the other until both have the same temperature. Based on this theory it is hot or cold tea in a thermos will lose heat or absorb heat from its place. However, the flasks are designed to be inhibiting ketida how heat can be transferred: conduction, convection, and radiation.
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| Gbr. James Dewar |
Flasks made of glass-walled duplex, Naah between the wall and the vacuum created one wall is lined with a shiny layer (here we use silver). In the flask there are two walls of glass, each of which is made shiny. The inside is shiny so that the heat from the hot water is not absorbed by the wall. While the outside walls are made of glass polished and coated with silver, aim to prevent heat transfer by radiation. Vacuum is used here to prevent heat transfer by convection. Close the flask was not functioning? Obviously there dong, the cap is made of insulating material here, useful for preventing heat transfer by conduction. Thermos Structure Along The explanation.
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| Gbr. Structure Flask |
Description :
Close Stopper Thermos = Prevent conduction heat transfer. Wall In Glass = Prevent heat transfer from the hot water that is not absorbed by the wall.
Outer Wall Glass = Prevent heat transfer by radiation. Space Vacuum (Vacuum) = Limiting the possibility of heat lost from or enter into the flask with convection.
Wall Pelingdung Glass = As an insulator between the glass tube with the surrounding air.
Retaining Rubber Glass = Maintain position bottles (glass) remain in place.
Explanation :
Thermos is one of the tools used to prevent the occurrence of conduction, convection, and radiation. So that the water we save will remain hot and we can use when we need. Well, the secret so that events apasih conduction, convection, and radiation can be prevented? The secret is in the inside of a thermos, it turns the material is made of a shiny material, such as silver. Shiny material is intended that the radiation delivered by water bounces back and not out of the flask. Meanwhile, if we look at the middle turns in the middle of the vacuum created intentional so it would minimize the possibility of conduction and convection. Since there is no medium in the vacuum, the event that is used by people to make and keep the water in a thermos flask keep hot.
Things to note in this flask is
1. The existence of a vacuum chamber is limited by the glass on one of the layers dilapisin by a shiny layer.
2. Thermos berprinsipkan on the use of materials that inhibit adiabatic heat exchange by conduction, convection, and radiation.
Adiabatic gas is change in circumstances in which no heat in or out of the system.
Conduction is the transfer of heat transfer that does not diserai constituent particles of matter, and cuman occur in solids.
Convection is the transfer of heat transfer with constituent particles of matter, and occurs in liquids and gases. Radiation is the transfer of heat without the required medium as the intermediary.
