Why is it that when eating canned food is not easy to open, poke a hole and it will be opened?

It should be that our atmospheric pressure is 1 10 to the 5th power, and the cans are vacuum-packed in order to extend the shelf life, so the air pressure inside is close to 0, and it is more troublesome to open it. If you poke a hole, the air will go in, and the internal and external atmospheric pressure will be balanced, so it is easy to open. Got it?

If you still don't understand, ask your junior high school teacher, junior high school science will learn atmospheric pressure. You can also look for the book of the second and first year of junior high school to take a look, and you will understand. Also, don't think that atmospheric pressure is useless, and without atmospheric pressure people will disintegrate.

Hope mine is helpful to you.

Hello! This is also an easy way to tell if a can is fresh.

ps: In the extreme case, expired cans, the tin cans cover will generally bulge, that is, the gas top, on the one hand, with the change of ambient temperature, thermal expansion and contraction; On the other hand, the internal pressure is reduced, so it is easy to open, and the can that has been stored for a period of time will release some gas. Poke a hole to release the gas inside the sealed can.

Mine, are you still satisfied?

In the sealed can, on the one hand, it expands and contracts with the change of ambient temperature; On the other hand, cans that are stored for a certain period of time will release some gases. Poke a hole to release gas and reduce internal pressure, so it is easy to open.

PS: In the extreme case, expired cans, the tin can lid will generally bulge, that is, the gas top. This is also an easy way to tell if a can is fresh.

Because the air inside the canning box is not less, the air pressure is low. The air pressure outside is high, and the pressure presses on the can lid, so it is not easy to open. On the contrary, after you take a look at the barrel, the air pressure inside is the same as the outside, so it is easy to open!

Physics is learned! Because the atmospheric pressure inside the tank is less than the atmospheric pressure outside the tank, the atmospheric pressure outside the tank suppresses the iron sheet, and when a hole is opened, the internal and external atmospheric pressure is balanced! So it's good to open.

The internal and external air pressure is balanced.

Cans that can't be opened with the power of the wilderness are easily terminated, learn these three tricks, and teach you to easily open all kinds of cans in seconds.

These methods of opening cans are very powerful, and it would be a pity not to know.

With this can opener, even a girl with little strength can easily open it, and she doesn't need a boyfriend anymore

I don't know what type of cans you are referring to, there is a tinplate can, one is a glass can, and the two opening methods are different, but it doesn't matter, let me tell you, the opening method of the two types of cans.

How to open tinplate cans:

1.First, soak the tinplate canned fruit in hot water for 3-5 minutes, so that the temperature of the gas in the can increases, and the air pressure increases, which is the principle of thermal expansion and cold contraction. Turn the canned fruit bottle upside down for a while, wait for the liquid inside to destroy the vacuum of internal and external pressure, tap the bottom of it with the palm of your hand, and then gently pull the pull ring, it is easy to pull away.

2.To open the canner, separate the handle and clamp the fruit can to be opened with the head, and turn the knob to open the tin can. Remember, when you turn the knob, you can only rotate clockwise, not counterclockwise.

3.The Swiss Army Knife has a special tool for opening fruit cans, hook the outer edge of the can with a hook at the bottom, and press down the lid of the can with the front edge, as if there is a circle of grooves on the edge of the top cover. Press it in and push it forward, taking care not to press the head into it, otherwise there may be wear and tear.

The bottom hook hooks the outer edge of the can, and the front edge of the can is pressed down forcefully, as if there is a circle of dimples on the edge of the top lid. Press it in and push it forward, taking care not to press the head into it, otherwise there may be wear and tear. This tool is also very easy to use.

4.Household kitchen knives and pliers, use a kitchen knife close to the side of the handle, put it in the middle of the canned fruit, and then press down gently, it is the knife head into the can, gently push the handle, so that there will be a gap in the can, and then use pliers to pull the iron piece at the opening, so that it is opened, but be careful not to hurt your hand.

5.Screwdriver and hammer, find a household screwdriver, preferably flat, along the depression of the lid of the fruit can, gently hit the handle of the screwdriver with a hammer, and hit it round so that it opens.

In fact, the opening method of tinplate cans is mainly for canned fruits in small black cans of Jingyu, but other cans are applicable as long as they are tinplate cans, the method is very good, and it is worth recommending.

How to open glass jar cans:

1) Put some hot water in a bowl and turn the can upside down in the water. After about 10 minutes, take it out again and it will be easy to open!

2) Use a sharp object, pry under the lid, and hear a "flutter" sound, it is an air leak, and it is easy to open.

3) Turn the can upside down, and gently knock the lid on the ground with skill, and hear the click. After the sound, it means that the air inside has escaped out, and finally twist it in the opposite direction with both hands.

The easiest way to do this is to buy cans with pull tabs;

If it is a canned fruit, the idea is to pry the cap of the bottle, and as soon as you take in the air, you can unscrew it directly with your hands.

If it is canned meat, use a sharp instrument to knock out the hole in the edge of the lid, and then insert a hard object and pry it open little by little.

There are many ways to open a canned bottle.

1. Turn the canned bottle upside down and pat it, and the cap can be easily opened.

2. Use a lighter to burn the cap for a while, and you can easily open the cap.

3. Soak the canned bottle cap in hot water, or open the cap in the same way.

4. Use a screwdriver to loosen the edge of the cap, and you can easily open the cap when you hear the sound of air entering the bottle.

Haha, if you haven't opened it yet, you can use violence. Be careful to leave the glass slag behind.

The cans are made of glass, but the lid is set like metal, making it difficult to open. Some people like to pat the bottom of an unopened canned bottle (the bottle is turned upside down), so that it will be much easier to open when the cap is opened; Another way to make it easier to open the cap is to turn the cap around the flame of the lighter, then wait a few seconds and then turn the cap directly by hand, so that the can lid can be opened very easily.

Take a kitchen knife and stick it on the lid to let the air inside, twist it slightly, and it will open. Simple and labor-saving.

1. Turn the canned bottle upside down and pat it, and the cap can be easily opened.

2. Use a lighter to burn the cap for a while, and you can easily open the cap.

3. Soak the canned bottle cap in hot water, or open the cap in the same way.

4. Use a screwdriver to loosen the edge of the cap, and you can easily open the cap when you hear the sound of air entering the bottle. How can I easily open the cap of a canned bottle with a very secure cap? Please note that canned bottles are glass and cannot be pry with tools.

Of course, you can't break the bottle of the can! 1) Tool treasure chest: a box of canned food, a basin of water, boiling water, a pair of insulated gloves; 2）diy：

Carefully fill the basin with half of the boiling water; Put the cap of the can in boiling water for half a minute, then remove; Put on the heat-insulating gloves, then lift the cap upwards with your hand, and the bottle opens without much effort; 3) Science in operation: The canned bottle is not easy to open because there is a low pressure inside the canned bottle. It turns out that when the hot can is put into the bottle, the hot air occupies a relatively large space inside the bottle, and then it is sealed.

However, when cooling, a low pressure is formed inside the canning bottle. And after putting it in hot water, the air inside the bottle expands by heat, and the air pressure inside the can bottle gradually increases, so that you can easily open the can bottle.

1. Turn it upside down and pat it, and the cap can be easily opened.

2. Use a lighter to burn the cap for a while, and you can easily open the cap.

3. Soak the canned bottle cap in hot water, or open the cap in the same way.

4. Use a screwdriver to loosen the edge of the cap, and you can easily open the cap when you hear the sound of air entering the bottle.

Haha, if you haven't opened it yet, you can use violence. Be careful to leave the glass slag behind.

Many people often can't open it when eating canned luncheon meat, in fact, there is a little extra iron on the iron can, and you can open it by turning the key by aligning it with the iron key hole.

1. Buy a Swiss Army knife, generally there should be a tool with a can like a key, and there is a protruding strip on the can, and the can can can be easily opened with that tool.

2. Take a kitchen knife, tilt it upwards, use the knife at the lower end, and knock out a small hole along the circle little by little, with a little patience.

3. Some cans are attached with a can opening key, and there is a rectangular hole on the opening key. Find a short section of iron sheet on the can that is easy to warp, put the iron sheet through the small hole in the key to open the can, and then follow the lines and roll along the roll.

4. Put the canned luncheon meat flat on the ground, push it back and forth hard, grind it through a few times, grind it around to grind off the layer of edging or grind it open, and then find a hard object to pry open the lid of one side of the canned food casually, and then knock it, and the whole canned meat will come out, and it will not damage the shape at all.

5. There is also a flat smash on the ground, smash a few times to roll the edge will be opened, and then find a hard object to gently pry around the lid of the canned food to pry it open, and then knock it, the whole canned meat will come out, of course, the shape will be a little damaged.

How long does canned luncheon meat last after opening.

Generally, the canned luncheon meat after opening it must not be eaten at one time, and then put it in the refrigerator, in response to this problem, it cannot be said that it can be eaten for a few months, it is unrealistic, the nitrite in the luncheon meat is easy to produce sodium nitrate because it is in contact with oxygen, which is harmful to the human body, and the canned food refrigerated in the refrigerator will become very inferior, in winter, it can not be put in the refrigerator for more than two weeks after dismantling, and if it is in summer, try to eat it within 3-5 days, and you can almost throw it away on the fifth day. If you don't have a refrigerator, then no matter winter or summer, it's best to eat it on the same day, and the canned food that stays overnight can be thrown away, and you can't go to the hospital again in order to save **, the gain outweighs the loss.

1. You observe, there is a little extra iron on the iron can, like a cigarette has not been opened, you follow this little bit of leaking iron to the iron key hole, and then twist the key to get it open. It's like opening the wrapping film of a cigarette, except that it's metal and you have to screw it with a key. I don't know if you understand.

2. Buy a Swiss Army knife, there is a special tool for opening this kind of can, imitation of that kind can also be, but not as sharp as this, there should generally be a tool like a key with the can, there is a protruding strip on the can, and the can can can be easily opened with that tool.

3. When there are no tools, you can directly grind the bottom surface of the can on the ground, and after grinding off the folded fold, it is easy to open. That's what I did when I was a kid.

Alas... It's very simple, take a kitchen knife, tilt it upwards, use the knife at the lower end, and knock out a small hole along the circle little by little, a little patience, not troublesome, it used to be like this. It would be even better if there was that kind of special tool for opening cans, that kind of thing is not good for described.

4. Seeing the two protruding under Guilin, Shanghai, on the side of the canned luncheon meat, pry up the protruding part first, and then roll it up with a special tool on the luncheon meat box. It's simple.

Isn't the can with a key to open the can? Isn't there a rectangular hole in the can opening key? Find a short section of iron sheet on the can that is easy to warp, put the iron sheet through the small hole in the key to open the can, and then follow the line (that is the machine open, you can roll it down).

5. Push back and forth on the ground flat, grind through a few times, grind a circle to grind off the layer of edging or grind open, and then find a hard object to pry open the lid of one side of the canned food, and then knock it, and the whole canned meat will come out, and it will not damage the shape at all.

6. Smash it flat on the ground, smash it a few times and the curl will be opened, and then find a hard object and gently pry around to pry open the lid of one side of the can, and then knock it, and the whole canned meat will come out, of course, the shape will be a little damaged.

Simple way to open a can:Preparation tools Material: Canned.

Step 1: Prepare the cans.

Step 2: Flick your finger on the edge of the bottom of the can lid to let air in and release the pressure.

Step 3: Then twist your hands lightly and you're done.

Step 4: Girls can quickly unscrew it easily. Once opened, you can taste it.

Finally: be sure to pay attention to safety when opening cans, and never hurt your hands.

These methods of opening cans are very powerful, and it would be a pity not to know.

The easiest way to open a can:1. First, prepare the can and a plate to be opened.

2. Next, place the can to be opened upside down on the plate.

3. Then, pour the boiling water into a plate and let the water cover the canned bottle.

4. Finally, let it stand for about 1 minute, as long as it is easily twisted, it will be opened, and the problem will be solved.