Heat sealed glass jar with water- will it break?

In summary: We put the jars in a pot of boiling water and then removed them with a slotted spoon. We also used a pressure canner. The pressure canner has a gauge that tells you when the canner has reached the correct pressure. The gauge is set at 10 pounds per square inch gauge. The pressure canner seals the jars with a vacuum. We then heated the canner to the correct temperature and placed the jars in it.
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If you fill a glass jar with water, or any other liquid, then seal the jar tightly , then heat the jar, will the jar break as the liquid inside tries to boil? Is it a dangerous experiment to try?
 
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  • #2
Depending on how much heat, it can be dangerous, as the pressures can become very large and burst the jar.
 
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What about the boiling point of the liquid inside the jar? Suppose the jar is full of water, and you heat it to 101 degrees C. Will the pressure be so great at that point? What about when you are canning food. Don't you cover the jars and place them in boiling water for several minutes to sterilize the contents? So I figure at this point the pressure must not be high enough to burst the jars?
How high can you safely heat the jars while canning?
 
  • #4
You don't do the lids up tight when making jam or they can explode. A tin can isn't so rigid.

Increasing pressure increases the boiling point,
 
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megawatt said:
What about the boiling point of the liquid inside the jar? Suppose the jar is full of water, and you heat it to 101 degrees C. Will the pressure be so great at that point? What about when you are canning food. Don't you cover the jars and place them in boiling water for several minutes to sterilize the contents? So I figure at this point the pressure must not be high enough to burst the jars?
How high can you safely heat the jars while canning?
During canning, water evaporates into the head space in the jars. As the temperature of the jars approaches boiling, the partial pressure of water vapor in the head space approaches one atmosphere. Together with the preexisting air, this could lead to a total pressure as high as of two atmospheres in the head space. Because the lids are not sealed tightly, some gas mixture escapes. Part of this mixture will be water vapor. Part will be air. The result is that the partial pressure of air in the head space is reduced.

When heat is removed, the water vapor condenses. The total pressure in the head space decreases and the lid is pulled inward, making the seal tight. If the heat was enough to sterilize the contents and if the vacuum seal forms then the canned food will not be subject to bacterial decay. One insures the former by boiling the jars long enough. One insures the latter by "pinging" the jars to make sure that the lids are on tight.

When I have done home canning, we always used a water bath. This means that the temperature of the jars never exceeds boiling.
 
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1. Can a heat sealed glass jar with water withstand high temperatures without breaking?

It depends on the type of glass used for the jar. Some glasses are designed to withstand high temperatures, while others may break under extreme heat. It is important to check the manufacturer's instructions for the maximum temperature the jar can withstand.

2. How do I properly heat seal a glass jar with water?

To heat seal a glass jar with water, first ensure that the jar is completely clean and dry. Place a lid on the jar, leaving a small gap for air to escape. Heat the jar in a hot water bath or in an oven at a low temperature until the water inside reaches the desired temperature. Once heated, quickly tighten the lid to create a seal.

3. What happens if I heat seal a glass jar with water and then cool it too quickly?

If a heat sealed glass jar with water is cooled too quickly, the sudden change in temperature can cause the glass to crack or shatter. It is important to allow the jar to cool slowly to avoid this potential risk.

4. Can I reuse a heat sealed glass jar with water?

Yes, you can reuse a heat sealed glass jar with water. However, it is important to thoroughly clean and dry the jar before each use to prevent any potential contamination. Additionally, be careful not to overheat the jar during the sealing process, as this can weaken the glass over time.

5. Is it safe to store hot liquids in a heat sealed glass jar?

It depends on the type of glass used for the jar. Some glasses are designed to withstand high temperatures, while others may not be suitable for storing hot liquids. It is important to check the manufacturer's instructions before using the jar for hot liquids to ensure it is safe to do so.

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