HomeMasterHow can I vacuum out the air from a glass jar?
How can I vacuum out the air from a glass jar?
I don’t need a particularly strong vacuum, I would like to make a simple solar heater out of the jar.
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One of the most effective and cheap ways to create a vacuum is to use water pressure and the venturi effect. You could build a venturi valve. Google it. The large DIY stores have small fitting for plastic tubing.
As an alternative, you could try heating a material to above its boiling point. When it cools and changes phase back to a liquid (solid would be better) the pressure will drop drastically. Obviously this approach requires that the operation of the solar collector result in temperatures much lower than the boiling point of the contained substance.
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by the way. your jar could explode. this is probably NOT a good idea. You need a container built to withstand the tremendous forces. A full vacuum is 14.7 pounds per square inch – so even a small bottle will be under hundreds of pounds of stress!
Look for a vaccuum packer/sealer. They are primarily marketed to vacuum pack and heat seal plastic bags for long term storage of dry goods, and to prevent freezer burn for frozen food. We have a Foodsaver brand that comes with a assessory for evacuating jars.
If you don’t care about things getting hot and wet, you can easily create a partial vacuum in a mason jar with a canning lid on it. These lids are designed to act like a valve – air and steam can exit, but can’t get back in. So, partially fill with water, put the lid on it loosely, and boil the water inside by placing it in a pressure cooker partially filled with water. You can put it on the stove directly, but that’s kinda dangerous. As the water boils, steam air is purged from inside. When it cools, only water vapor at the room temperature partial pressure of water is left behind (pretty low)
One of the most effective and cheap ways to create a vacuum is to use water pressure and the venturi effect. You could build a venturi valve. Google it. The large DIY stores have small fitting for plastic tubing.
As an alternative, you could try heating a material to above its boiling point. When it cools and changes phase back to a liquid (solid would be better) the pressure will drop drastically. Obviously this approach requires that the operation of the solar collector result in temperatures much lower than the boiling point of the contained substance.
<<<edit>>
by the way. your jar could explode. this is probably NOT a good idea. You need a container built to withstand the tremendous forces. A full vacuum is 14.7 pounds per square inch – so even a small bottle will be under hundreds of pounds of stress!
Look for a vaccuum packer/sealer. They are primarily marketed to vacuum pack and heat seal plastic bags for long term storage of dry goods, and to prevent freezer burn for frozen food. We have a Foodsaver brand that comes with a assessory for evacuating jars.
If you don’t care about things getting hot and wet, you can easily create a partial vacuum in a mason jar with a canning lid on it. These lids are designed to act like a valve – air and steam can exit, but can’t get back in. So, partially fill with water, put the lid on it loosely, and boil the water inside by placing it in a pressure cooker partially filled with water. You can put it on the stove directly, but that’s kinda dangerous. As the water boils, steam air is purged from inside. When it cools, only water vapor at the room temperature partial pressure of water is left behind (pretty low)