A thermos flask minimises exchange of heat by
Answers
The space between the two walls is almost vacuum and the walls are sealed at the top. The double-walled glass vessel and vacuum prevents heat loss by conduction. The insulating stopper or cork at the top minimises heat loss by convection.
Answer:
✯QUESTION:
A thermos flask minimises exchange of heat by
✯ANSWER:
The thermos flask consists of a double-walled glass vessel resting on a cork inside a metal or plastic case. The outer surface of its inner wall and the inner surface of its outer wall are silvered. This prevents heat transfer due to radiation. The space between the two walls is almost vacuum and the walls are sealed at the top. The double-walled glass vessel and vacuum prevents heat loss by conduction. The insulating stopper or cork at the top minimises heat loss by convection. Vacuum flasks are used at home, and in laboratories and industries to store liquids that become gases at low temperatures
✯ADDITIONAL INFORMATION
◉What is thermoflask?
is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.
◉other names for thermo flask
- Dewar flask
- Dewar bottle
- vacuum flask
◉Safety
thermo flasks are at risk of implosion hazard, and glass vessels under vacuum, in particular, may shatter unexpectedly. Chips, scratches or cracks can be a starting point for dangerous vessel failure, especially when the vessel temperature changes rapidly (when hot or cold liquid is added). Proper preparation of the Dewar vacuum flask by tempering prior to use is advised to maintain and optimize the functioning of the unit. Glass vacuum flasks are usually fitted into a metal base with the cylinder contained in or coated with mesh, aluminum or plastic to aid in handling, protect it from physical damage, and contain fragments should they break
How Thermos Work
A thermos doesn’t give heat room for heat transfer by any of the three ways including convection, conduction, and radiation, which heat can travel. It is the silver coating located on the internal surface of the thermos that puts a stop to heat transfer by radiation, while the vacuum connecting its double wall avoids heat moving by convection.
✯ADVANTAGES
◉Preservation of hot food Items
Thermos is very useful for keeping tea or coffee hot in winters. It is used to savor the original taste of your food item, tea or coffee. Thermos is insulated and can be of great help any time any day.
◉Keeping Cold Water Cold
Thermos is not only used to keep things hot, it is also used to keep cold thing cold for hours. Consequently, in a hot weather condition, thermos is the perfect choice to keep your cold drinks cold all day long.