Have you ever wondered how this simple thermos flask water bottle can keep the liquid cold and heated when you pour cool juice or warm water from the thermos flask? Also, do you ever know how long it keeps cool or heat? Fortunately, in this post, the author would solve the above questions.
Thermos How Does it Work?
The thermos flask actually makes use of the principle of minimizing heat transfer through conduction, convection, and radiation, by utilizing a vacuum layer and insulating materials.
First, the thermos flask typically consists of two layers of glass or metal that are separated by a vacuum. The space between the inner and outer walls is evacuated to create a vacuum space. Vacuum space is an area devoid of air or other matter, which significantly reduces heat transfer by conduction and convection. Since there is no air or other gas to transfer heat, the vacuum acts as an excellent insulator. Second, the thermos flask also be coated with a reflective material, such as silver or aluminum. This coating helps minimize heat transfer through radiation by reflecting thermal radiation back into the flask. Third, it also is designed with the physical setting ---- stopper to ensure the vacuum design and reduce heat transmission. The stopper directly prevents the heat transmit to the outside. Also, the stopper also can prevent the air get into the vacuum space.
Therefore, three designs corporately prevent minimizing heat transfer into or out of the flask. However, heat transmission is inevitable as time goes by.
How Long Does A Thermos Flask Stay Hot?
Looking through the market, the thermos 1liters water bottle can stay the liquid hot for an average of 12-18 hours. And, the holding time usually be determined by the usage and ambient temperatures. The Yuefeixiang’s thermos 1liters water bottle can keep hot for 12 hours.
How Long Does A Thermos Flask Keep Things Cold?
And, the time of keeping things cold is also different, which depends on the brand and design of the thermos flask. Then, Yuefeixiang’s thermos 1liters water bottle can keep cold for 24 hours.
What Causes thermos 1 liter bottle to Lose Heat?
Although a thermos 1 liter bottle is designed with multiple components to maintain the temperature of the inside temperature, it still lost heat due to several reasons. Then, in this section, the author would illustrate some factors that cause the thermos kitchware to lose heat.
●Thermal Radiation
Although thermos flasks have a reflective coating on the inner surface to reduce heat loss through radiation, some radiation can still occur. In other words, a small amount of heat can be radiated from the contents of the flask to the surrounding environment. This radiation is slight.
●Conduction through the Stopper
Although the stopper is the physical component to ensure the tight sealing of the bottle, it may still conduct some heat, especially the metal stopper. The metal stopper has a good heat transfer performance, so it could play a role of a bridge for heat transfer. After that, this can result in some heat being conducted from the contents of the flask to the outer surface of the stopper and eventually to the surrounding environment.
●The Opening of the Thermos Flask Water Bottle
Whenever the thermos flask is opened, heat loss inevitably occurs due to the exchange of air and the introduction of colder air from the environment. The long-lasting opening of the thermos flask would let a large amount of heat escape, as a result, the temperature of the contents would get affected.
●Time
Over an extended period, even with effective insulation, some heat loss is inevitable. While the vacuum insulation and double-walled construction of a thermos flask significantly reduce heat transfer, there may still be a gradual transfer of heat from the contents to the surroundings over time.
Do A Thermos Have to be Full to Stay Hot?
As a matter of fact, the thermos flask still keeps the temperature, even if the bottle is not completely full. The ultimate factor determining heat retention is the vacuum insulation and the double-walled construction of the thermos flask, rather than the volume of the liquid inside.
Conclusion
All in all, a thermos flask is a good invention that can keep the liquid cool or hot, so we can have a cool drink in the hot wave of summer and get a cup of warm tea in the cold winter. If you are looking for a high-quality vacuum flasks kitchen, you can email us: at [email protected] to get more info.
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