Know and use stainless steel thermos cup

When you own a stainless steel thermos cup, its quality and capacity are a foregone conclusion, because the thermal insulation effect of stainless steel thermos is mainly related to the manufacturing process of the product, and the thermal insulation effect of different processes varies greatly. The common stainless steel thermal insulation The cups are basically made of double-layer vacuumed stainless steel and glass. If you want to improve the thermal insulation effect of the stainless steel thermos cup, you can only start with the method of use and start with the details. So how can we use the stainless steel vacuum flask to improve its thermal insulation effect?

2, the extended insulation effect of stainless steel vacuum cups is very important

We must understand a scientific concept: a good conductor of heat can speed up the dissipation of heat from an object, and a poor conductor of heat can slow down the dissipation of heat from an object. Stainless steel metal is an excellent conductor of heat. It absorbs heat quickly and dissipates heat quickly. Materials such as plastic, glass, and ceramics are poor conductors of heat, and air is also a poor conductor of heat. Maybe you want to ask me why stainless steel thermos cups are made of stainless steel. And what about vacuuming?

The use of stainless steel is mainly determined by the characteristics of the material, such as safety, pressure resistance and other factors. It is precisely because air is a poor conductor of heat, so the excess air should be pumped away, so that the heat conduction will be slower. ! There are three ways of heat transfer: convection, conduction, and radiation, so even in a vacuum environment, heat can be transferred, but the speed is slowed down. The effect of vacuuming the stainless steel thermos cup can only play the role of blocking heat conduction as much as possible, but in fact, heat conduction will still occur. When the temperature of the water in the stainless steel thermos cup is higher than the outside temperature, it can slow down the rate of decline of the water temperature in the cup. , When the temperature of the water in the stainless steel thermos cup is lower than the outside temperature, the rate of increase of the water temperature in the cup can be slowed down. Therefore, the stainless steel thermos cup can not only keep hot water hot, but also cold water.

After understanding these truths, the next step is to use it. When we use a stainless steel thermos cup to fill boiling or ice water, we can put a little in it to preheat or pre-cool it, then dump it and then put the boiling water or ice water in it, but do not Fill the entire liner, leave a part of the gap, so that the water cannot contact the lid, due to the slow thermal conductivity of the air, the cork isolates the convective heat transfer at the bottle mouth, and the water temperature drops slowly, and because there is a Air, at first, a large amount of air is discharged from the bottle due to thermal expansion, and then the temperature in the bottle decreases, so that the atmospheric pressure in the bottle is lower than that outside the bottle, which is more conducive to heat preservation.