fire

Is it possible to keep the fire in a jar

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no, and that's not something i would try

real safety hazard that

fire needs air to burn so no and indeed a hazard it would be if possible

yep, air and fuel and glass will shatter

i really don't understand sometimes about these questions, please use common sense

No.

When I was at school, boys would have a small amount of burning charcoal in a jar.We heated the jar first, and didn't of course use a lid! We used them as hand warmers in winter. But quite often the bottom of the jar would crack and fall out. We used to carry these about on a loop of string. They did work for a time; even a lighted candle was good as a warmer. An empty bean can was best!

im assuming you used a very thick mason jar?

they don't make em like that anymore : )

Oh, no! Not a thick jar; in fact the thinner the better. These were small jam (jelly) jars.I remember the Science teacher telling us that the bottom *thickest* part of the jar would crack because the outside of the glass was colder than the inside.
AS I said, we soon got used to the idea that an empty can was best. It held more burning coals, too!

alright I stand utterly corrected

Besides Brysings heater jar/can I was watching public television today and there was a show on crafts. the guy made a really cool lantern using a mason jar.

he made a kind of handle using some heavy gauge wire. then he put some colorful gravel/stones at the bottom and put a tea light candle on top of the gravel. then he lit it using one of those long lighters. it was very nice and charming

so yeah, it is possible to put fire in a jar without burning yourself or your house down.

~Thor

It is possible but very difficult