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It prevents contamination by airborne yeasts and molds which can grow on jams and jellies.

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15y ago
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15y ago

It will attract flies ants and bees, and will also likely go moldy

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13y ago

There will be no oxygen, which bacteria require to grow.

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Urooj Urooj

Lvl 2
3y ago

It will attract files ants and bees and will also likely go moldy

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Wiki User

12y ago

cos it does

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Q: How does keeping air out of the jar preserve jam?
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Related questions

Explain how keeping air out of the jar helps to preserve the jam?

So the jam can stay fresh.


How do you preserve jam?

Jam if made at home must be put into pre boiled jam jar's and still hot. To keep the top of the jam free of fungus wet the top of the jam with a little rum.


Why doese a jam jar have 145 grams in it?

The contents of the jam jar is usually around 145 grams (i.e. not including the weight of the jar). This is usually because (although jam is a preserve, when it is made industrially it is not boiled to the extent that it would be when homemade, so is less "preserved" than it used to be), jam is not as long-life as it used to be. It is advised that it is kept in the fridge, so a 145g jar is usually the right size to fit in the fridge door.


What jars can you put chutney into?

Any jar that is air tight. Jam jars are perfect.xxx


How did the Israelites preserve the covenant?

Answer 1They put it in a jam jar with a lid on held in place by a rubber band.Answer 2By acting in accordance with the mandates of the covenant.


Why does hot air open a jam jar?

Periberri12: I think it is because, the air pushes the cap off. Air is very strong. Perinberri12:


What container would hold a jam?

A jam jar.


Things that can be found in the kitchen that start with the letter J?

Jam, jelly, juice, jalapeno peppers, jambalaya, jars, jerk seasonings, jerky chicken or beef, and jumping children!


Where to get Jam jar labels?

Check for jam jar labels in the canning section of any hardware or grocery store.


What is 125 mls Apricot jam?

That is a 4 oz jar of jam.


Is a jam jar biodegradable?

It depends upon the material of which the jar is made. If it is made of glass, as virtually all jam jars are, it is not biodegradable.


What is the weight of an empty jam jar?

The weight of an empty jam jar can vary depending on its size and material. On average, a small empty jam jar may weigh around 100-200 grams, while a larger jar may weigh 300-500 grams.