What to do if the lid of the thermos cup cannot be opened

A thermos cup is actually a type of water cup, but it can be used to keep water warm. It will not let most of the heat in the water in the cup be lost. If you pour a cup of hot water into an ordinary cup, it will become cold after a while, but a thermos cup is different. It can continuously retain heat. The lid of a water cup may be unable to be unscrewed, and the same is true for a thermos cup. So, what should you do if the lid of a thermos cup cannot be unscrewed?

Whether the lid of a plastic cup, glass cup, travel cup or thermos cup cannot be opened, it is because after pouring hot water into the cup, the air and water inside expand. After a period of time, the water temperature drops, but it has contracted, which creates a pressure difference between the inside and outside of the cup, so it cannot be unscrewed. The key to opening the cup lid is to overcome the pressure difference.

Method 1: Turn the cup upside down, tap the bottom of the cup a few times, and then screw on the lid. If that doesn't work, you can soak the cup in hot water. When the water in the stainless steel thermos cup heats up and its volume expands (that is, the pressure inside the cup increases), it will be easy to open. Alternatively, you can put the cup in the refrigerator, take it out and run hot water over the lid to make it easy to open.

Method 2: Use a piece of metal sheet to gently pry down the gap between the cup mouth and the cup lid, so that it will be easy to open after air enters. Method 3: Use a rubber hammer to knock gradually or take it to a place that sells thermos liners. They have rubber hammers and opening techniques. They can handle problems like stainless steel thermos with misaligned threads. Using a rubber hammer will not cause any more damage, it will just straighten the threads.

Method three. In addition, you can also boil water, then take the cup, be careful not to put the entire cup in, just put the lid part in the water, don't put it in for a long time, 5 seconds is appropriate, then weigh the towel to see if it can be twisted open, this is also a usually effective method.

4. You can also just soak it in warm water. Because of the principle of thermal expansion and contraction, when you put ice in the thermos, the gas in the thermos will become smaller, making the lid tighter. On the contrary, if you add warm water outside, it will expand and the lid will loosen. Or you can open it if you leave it for a while!

Method 4: If the cup cannot be opened, you can tap the bottom to open it. 1. Use the inertia of the food inside to quickly hit the bottle cap, creating a small gap to facilitate the entry of air. 2. Make the internal liquid vibrate and enhance gasification. Both measures reduce the pressure difference between the inside and the outside, making it easier to open.

Method 5. The last method is to twist it hard. Of course, this is a last resort. As the saying goes, try your best to save the situation. If it still doesn't open, then there is something wrong with the product. It is recommended that you replace it with a new one as soon as possible and support water cups from genuine brands. Not only is the quality guaranteed, but you will also avoid such embarrassing situations.

If the lid of your water cup cannot be opened, it is recommended that you first find out the cause and then follow the above method to prescribe the right remedy. Although there is no guarantee that your water cup lid can be opened, these methods have their own scientific basis. So if you really can't open it, don't force it open with your bare hands, as this may damage your water cup. You can still refer to the above methods.