1、 What is the reason why the glass can't be opened

Various types of glassware are often used in daily life, and glass jars are a commonly used type. Many families purchase some glass jars as sealed jars to store food. However, sometimes there may be awkward situations where glass jars cannot be opened. So why can't glass jars be opened? The reason why a glass jar cannot be opened is usually due to the inconsistent internal and external air pressure caused by a long sealing time, and usually the air pressure on the outside of the jar is higher than that on the inside. Due to the almost vacuum inside the lid, it is very difficult to open it.

2、 What if the glass jar cannot be opened

It is common for glass jars to not open. When encountering this situation, we would love to smash the jar, but we still use force to unscrew it. If we use enough force, we can also unscrew it. However, it is usually difficult to open it solely by hand, and special methods need to be used:

1. Use a knife tip

Gently pry the bottle cap with the tips of scissors or knives, and then unscrew it. Because the glass jar cannot be opened due to inconsistent internal and external air pressures, pry the bottle cap with a knife tip to allow external air to enter. Once the air pressure inside the jar is consistent with the external air pressure, the jar can be easily unscrewed

2. The method of tapping with hands is also quite common, and many people also use this method when opening glass cans. First, bend your hands into an arch shape, place your fingers together, turn the jar upside down, tap vigorously 5 to 8 times, and then unscrew it. This method mainly involves causing small bubbles near the sealing rubber area to rupture when the air at the top of the can is inverted, resulting in a short-term increase in local density, thereby balancing the air pressure

3. If the above two methods still cannot open the glass jar, hot water can be used. First, put the glass jar into a basin, then heat the water in the basin until it can reach the top of the bottle and place it in the water. Let it sit for about half a minute and then unscrew it. The object expands and contracts when heated, and the bottle cap rapidly expands when it comes into contact with hot water. The bottle mouth also expands, creating gaps. After the atmospheric pressure outside the jar reaches equilibrium, it is easy to open!

The above is the solution for the glass jar not opening. I hope it can help you solve the problem.