Method 1: Turn the cup upside down, pat the bottom of the cup several times, and then screw on the lid.
Method 2: you can soak the cup in hot water, so that when the water in the stainless steel thermos cup heats up and expands in volume, it is easy to open it.
Method 3: You can put the cup in the refrigerator, take it out and pour the lid with hot water, and open it easily.
Method 4: pry the gap between the cup mouth and the cup cover gently with metal foil to make it easy to open after air enters.
Method 5: Knock with a rubber hammer or take it to the place where the hot water bottle liner is sold. They have rubber hammers and opening skills. For example, those hot water bottles with stainless steel shells can handle the dislocation of threads. Handling with a rubber hammer won't cause more damage, it just keeps the thread in place. Because it is rubber, there will be no scratches and dents when knocking. Of course, pay attention to the strength and location of knocking at the door.
Method 6: drill a small hole in the cup (or lid) to make it "leak" and achieve the balance of internal and external air pressure. However, this move can open the plastic cup, but it is not applicable to the thermos cup to prevent the function and appearance of the thermos cup from being damaged.
The reason why the bottle cap can't be opened
Plastic cups, glasses, travel cups or thermos cups can't be opened. This is because the air and water in the cup will expand after pouring hot water. After a period of time, the water temperature dropped, but it has shrunk, and there is a pressure difference inside and outside the cup, which can't be unscrewed. The key to opening the cup is to overcome this pressure difference.
If it is a glass bottle cap, why can't it be opened?
Method for open glass bottle cap
First, buy your favorite glass bottles, drinks, etc. For those glass bottles with metal lids, of course.
Second, find a relatively stable, hard and stressed place, such as a food table, steps or corner ground, to avoid being in an overhead position and prevent damage to tiles.
Third, turn the glass bottle upside down to ensure that the glass bottle cap can touch the ground or table.
Fourth, hold the glass bottle tightly and tap the bottle cap according to your own strength to let the air in. After knocking on the bottle cap, a little paint will fall off the surface. If you often open the bottle cap and tap it once, it will be in place.
5. Turn the bottle cap counterclockwise by hand, and with a little force, you can hear a bang and the bottle cap will open. Attention, when unscrewing the bottle cap, be careful not to get close to the clothes, lest the juice in the bottle splash on our clothes.
Five experiments and experimental feelings of opening the glass bottle cap
Bottle opening experiment 1: pry with a screwdriver and almost poke your hand.
First, pry open the bottle cap, pick up a screwdriver and pry open the can cap. I tried to pry it a few times and heard the glass on the bottle mouth hiss. The screwdriver slipped and almost stabbed my hand. Stop prying, and then twist the bottle cap hard. The bottle cap won't open.
Then I pried it a second time, and this time I changed three pry points, until I heard a bang, and the can bottle seemed to breathe a sigh of relief.
Twist the bottle cap again, and this time it was unscrewed without much effort. The whole process takes 50 seconds.
Experimental feeling: In the process of prying, the force exerted by the screwdriver on the bottle mouth is very small, and some of them cannot be exerted. In addition, the screwdriver is easy to slip and it is easy to poke your hand if you are not careful.
Opening bottle cap experiment 2: it takes time to pat the bottom of the bottle hard
Then, I tried the method of "patting the bottom of the bottle". The can bottle stood upside down, patted the bottom of the bottle three times with the whole palm, and then twisted the cap hard, but it didn't open several times. Then he patted the bottom of the bottle and screwed on the cap. This was repeated three times before the reporter opened the bottle cap. The whole process takes 1 minute and 20 seconds.
Experimental feeling: when patting the bottom of the bottle, the palm hurts. Generally speaking, it is not suitable for ladies with less strength to open cans in this way.
Open bottle experiment 3: soak in hot water for 20 seconds and get it easily.
The principle of these two methods is to deflate cans and bottles. Next, we will try to use the principle of "thermal expansion and cold contraction" to open the bottle cap. Invert the can bottle in a bowl filled with hot water and let the water drown the whole bottle cap.
The timer starts counting. After 20 seconds, take out the can bottle, dry the water on the bottle cap, and easily open the bottle cap with a little force.
Experimental feeling: This method is very simple and powerful. It saves time, because it needs bowls and hot water, which is suitable for family use.
Experiment 4: It is dangerous to bake the bottle cap with open flame.
Similarly, it also uses the principle of "thermal expansion and cold contraction". If there are no hot water and hot water containers around, some people think of heating the bottle cap with a lighter. When the lighter is lit, the bottle will make a burning sound. Heat the bottle cap evenly with a lighter. After about ten seconds, I spread a towel on it and screwed on the bottle cap, but it still didn't work after a few twists. Subsequently, the above process was repeated and heated evenly with a lighter for more than 30 seconds, which succeeded this time. The whole process takes 1 min12s.
Experimental feeling: baking bottle caps with fire is easy to burn your hands and has high risk. Besides, it is not convenient to put towels when screwing.
Experiment 5: Bottle caps are easily broken when touching the ground.
In the absence of any tools, besides slapping the bottom of the bottle with the palm of your hand, there is another method available, that is, knocking the bottle cap several times on a hard plane to achieve the purpose of "deflating" the bottle.
The reporter picked up the can bottle and tapped on the floor tile. After knocking, he screwed the bottle cap by hand, without success. Subsequently, the reporter stepped up his efforts and smashed it several times. After smashing, he screwed the bottle cap and repeated it three times before opening it. It took 1 minute.
Experimental feeling: when knocking, you should grasp the strength, otherwise it is easy to knock the glass to the bottle mouth.
Experimental conclusion of opening the bottle cap
Compared with the five methods of opening cans, hot water soaking is the safest, simplest and most time-saving; It is also faster to pry with a screwdriver, but it is more dangerous. It is not recommended to pry open cans with a screwdriver.