One question at a time please & once the person asking the question is happy with the answer they'll say "next question please" & anyone can chime in with the next question. (fun, fun, fun!)
You can get a sticker that attaches to the side of the bottle that gives an indication of the level. Or you can boil the kettle, pour it over the bottle and then run your hand over the bottle. You will feel where the hot and cold meet and that is the level.
A very cold frosty morning will show the condensation up as well. Can be hard to see sometimes on the silver paint they use.
I wonder if one of those "point & shoot" thermometers would do the job?
Anyone?
******************* BruceS
Mannum, SA
********************
the temperature is the same whether its gas or liquid in the bottle, its only the CHANGE in temperature that you notice when hot water is applied.
So the "point and shoot" thermometers don't work -unless you tip water anyway.