tea or coffee pot are often made shining bright.they keep liquids hot or cold for a long time by the process of
Answers
Answer:
Vacuum flask technology was invented in 1892. Nowadays, it is commonly used by the average person to keep drinks hot or cold! It doesn’t necessarily have to keep a liquid hot. Rather, the true purpose of a vacuum flask in the form of a thermos is to keep your beverage of choice at the correct temperature.
Drinks lose heat to their surroundings, and cold drinks take on the temperature of their surroundings. Looking specifically at heat, a vacuum flask reduces heat loss via convection and radiation. Thermos and vacuum flask mugs have a silver lining, thus preventing heat loss from radiation.
The vacuum flask is responsible for heat loss prevention via convection. Heat cannot move through a vacuum, and so the double wall of a vacuum flask does not allow heat to travel through.
Then, any additional layers are for protection, style, and additional insulation.
Vacuum flask mugs can often keep hot drinks hot for around 4–5 hours, and cold drinks remain cool for about 12 hours.
☆☆Answer☆☆:-
As the molecules collide, some of that energy transfers, warming up the cooler molecules and cooling down the hotter molecules in a process known as conduction. When you put your cool hands against a warm cup of coffee or tea, your hands will eventually get warmer because heat is transferring from the cup to your skin.
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