What is the principle of heat retention in a thermos?

What is the principle of insulation in a thermos?

·Insulated cups are essential in people's daily life during the cold winter and hot summer. Many people like to drink hot water in the winter and cold water in the summer, the insulation cup can keep the water temperature, so everyone will basically use it in winter and summer. So, why can it keep warm, the principle behind you know?

·Thermos from the development of thermos flasks, insulation principle and thermos flasks, only for the convenience of carrying the bottle into a cup. Earlier, people used thermos bottles to store hot water, thermos bottles, also known as hot water bottles, boiling water bottles or warming pots, the shell made of plastic, tin or gabion, containing a double glass liner, silver plating on the glass in the sandwich, the mouth of the bottle is closed with a wooden stopper.

·Heat transfer has three ways: heat conduction, heat convection and heat radiation. Thermos bottle liner is a double glass structure, the middle of the vacuum, you can reduce heat conduction; glass liner is not easy to heat transfer cork plug, pour hot water can reduce heat convection; bottle liner between the double-layer glass plated with silver, can be reflected back to the bottle heat radiation. Don't underestimate a small thermos, it perfectly uses the three ways of heat transfer, so that the insulation effect is optimal.

·The earliest thermos cup liner is a small thermos bottle liner, only for drinking convenience, the liner mouth into an open mouth. With the development of society, this fragile glass liner insulation cup has rarely seen, more is the use of stainless steel material made of insulation cup, but the principle of insulation is the same. Stainless steel insulation cup is a double-layer structure, the inner liner and the cup body of two layers of stainless steel between the welded combination, pumped into a vacuum, the vacuum does not transfer heat; insulation cup of the cork sealing performance is good, through convection, the heat dissipated is very little. In the inner liner and cup body between two layers of stainless steel plated with copper or silver, can effectively reduce the heat lost by radiation. Stainless steel thermos is easy to carry, durable, easy to clean, and has gradually become the new favorite on the market.

·In general, the worst place for insulation is the neck of the bottle, so the insulation effect of large-capacity small bottle mouth insulation cup will be better. When self-driving travel, outdoor sports, large-capacity insulation cup becomes a must-have equipment.

·An insulated cup keeps the temperature rather than keeping it warm, so it can keep not only hot water at a certain temperature, but also things like ice-cream. The structure of the insulation cup so that the inside of the heat is not easy to lose, the outside of the heat is not easy to enter the inside, so the insulation cup can keep "warm", but also can keep "cold". Summer travel, hot sun, in the insulation cup into the iced coffee, screw the lid tightly, will make you summer travel ice cool and comfortable.