Why is it easier to open when a can taps the bottom?

The can will be easier to open when we tap the bottom, because the air inside the can will continue to expand when we pat it, so it will be slightly easier to unscrew when we unscrew the can.

Put the jar upside down in boiling water and take it out after a minute or two, because the difference between the expansion and contraction of metal and glass is very large, so it opens as soon as you twist it. If you find this method a bit dangerous, you can try using a hot towel to warm it up, the same principle, you can use a dry towel to loosen it. Use the principle of leverage.

There are many ways to open a can. The surrounding solid objects can basically be. If you have friends who often like to eat canned food, you can buy a professional can opener, which is convenient and safe.

During the canning process, the canning needs to be sealed at high temperatures or under vacuum. In this way, a vacuum level is created in the tank after sealing.

and negative pressure, not easy to open. After a few pats on the mouth of the can, the can will vibrate instantly, and a small amount of gas will be generated in the can, reducing the vacuum, eliminating the negative pressure, and the can is easy to open.

However, heat treatment sterilization technology has been widely used. Food products can be stored after sealing heat sterilization or heat sterilization, which is economical and effective. The food inside the cans is not easy to replace after being sealed and sterilized.

If the canned food is not sterilized thoroughly, the food inside will be contaminated by microorganisms, resulting in the phenomenon of "listening to fat".

Canned food refers to the food that can be stored at room temperature for a long time and can meet the requirements of commercial sterility through processing, blending, canning, sealing, sterilization, cooling or aseptic filling of raw materials that meet the requirements. Canned food production has two key properties: tightness and bactericidal properties.

There are rumors in the market that canned food is vacuum-packed or with added preservatives.

In order to achieve the effect of long-term storage. In fact, canned food is first sealed rather than vacuum-packed, and then undergoes a rigorous sterilization process to achieve commercial sterility. In essence, it is impossible to stop the multiplication of bacteria with real space technology, and strictly speaking, there is no need to add preservatives.

I think this may make use of the principle of pressure. Tapping the bottom may cause pressure to hit the top, so it's easy to open.

Because the air pressure is more balanced when the can is tapped, it is easier to open at this time.

Because the contents of the can will ferment, the gas will be consumed or increased, resulting in an imbalance in air pressure.

As the air pressure inside will impact the top, it is easy.

This increases the pressure inside the bottle, reduces the pressure difference, and makes it easier to open.

Because this can increase the pressure inside and reduce the pressure difference.

The gas given to them will constantly change, and the thick base you shoot will expand, and it will be easy to open.

Because there is still a certain amount of air inside the can, this will happen.

I think this will make the gas from the bottom go up to the top, so that's why it will be opened.

Maybe there's some air plate inside it, just slap it hard.