What should I do if the lid of the thermos cup won't open and it is sucked?

1. First, turn the cup upside down and pat the bottom of the cup, then twist the lid hard, and finally the lid can be unscrewed.

2. First put the cup in hot water, then wait for the water in the stainless steel thermos cup to heat up, and finally expand the volume to open it.

First, you can put the cup in the refrigerator for quick freezing, then take it out and pour the lid with hot water, and finally you can easily open it. A thermos cup is generally a water container and a vacuum layer made of ceramics or stainless steel. The top of the thermos cup is covered and sealed tightly. Vacuum insulation layer can delay the heat dissipation of water and other liquids in it, thus achieving the purpose of insulation.