Why do water condensation droplets appear on the surface of a double-layered stainless steel water cup after filling it with ice water

I bought a beautiful double-layered stainless steel water cup, which I use daily for drinking cold drinks. But why do water condensation beads appear on the surface of this double-layered water cup soon after filling it with cold water? This is confusing, what could be causing this?

As mentioned in the previous article, the stainless steel double-layer thermos cup can insulate both hot water and cold water. The principle of insulation is to use vacuum technology to remove the air between the double-layer shells, forming a vacuum state to prevent Due to the effect of temperature conduction, whether the stainless steel double-layer thermos cup is filled with hot or cold water, the surface temperature of the water cup is the natural ambient temperature and will not change due to the temperature of the drink in the cup. Therefore, if the stainless steel thermos cup is filled with ice water, the surface of the water cup will not cause water condensation due to low temperature conduction.

So why does water condensation still appear on the surface of the double-layer stainless steel water cup not long after it is filled with cold water? This starts from the requirements of production quality and finished product itself.

Since the finished product is a high-quality double-layered stainless steel thermos cup that can provide good heat insulation and will not cause condensation beads to appear on the surface after filling with cold water, then if condensation beads appear, it means that the water cup does not insulate temperature conduction. function, then if a reader friend buys such a water cup, the editor recommends that you contact the merchant in time to provide product issues and ask the other party to provide return and exchange services.
But there is another situation. Please take a closer look at the double-layered water cup we purchased. Does it clearly indicate that it is a vacuum cup? Some friends must be a little confused. Isn’t the double-layered water bottle vacuumized or insulated? Yes, not all double-layer stainless steel water cups will be vacuumed, and not all double-layer stainless steel water cups will have the heat preservation function, because some water cups are only designed to have a certain heat insulation effect, and some are The structural design is not suitable for vacuuming process, so readers please read the product description in detail.