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megawatt
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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?
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.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?
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.
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.
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.
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.
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.