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Is covering a mason jar necessary

Terry_17511

ecovering a mason jar with water necessary? Isn't it enough as lng as the water lever s about the ingredients

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Terry_17511

Sorry I can't see the text block when typing on my iPad and I can't make corrections

So, I wondered if It was necessary to completely cover a mason jar, that had is half full, if the water level is above the contents of the jar.

brian_martin2001

Air is a poor conductor. When using a jar, it's most efficient to use a jar as small as necessary to hold everything. Being able to have it sealed, along with being submerged in water, will aid in maintaining the desired temperature. It is not absolutely necessary, however, it is certainly more desirable, not to mention more efficient, than to have it as you suggest. Good luck!

solieus_80580

I wouldn't trust a jar floating on the surface. With the circulation, it could get jostled around and tip. Also if it is too full it will sink either way. You can re-use the mason jar lids if you are planning on only cooking perishables and not using them for actual canning/preserves.

tshewman

The challenge would be a few-fold: Keeping the water out of the product and limit evaporation. If you don't have a lid on it (similar to in-oven method), the water from the bath would evaporate relatively quickly at higher temps. If you have a cover over the water bath then any evaporation would gather on the lid and likely drip into the jars themselves (presumably not desired). If small jars the circulation from joule itself may splash small water droplets into the jars. You could use parchment and an elastic but that's basically a lid. Just some food for thought.