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Originally Posted by homealone
weigh a full one, then weigh an empty one, the difference is obviously the weight of the liquefied gas. So then if you weigh your part used one, take off the weight of an empty one, you should get an idea of whether it is half / quarter full, etc.  |
After years of having a family caravan as I was growing up, I learned how to tell just by the weight of it - it's impossible to describe but you can just tell pretty well by what it feels like when you pick it up. If it's getting empty you can shake it as well and hear if anything much is sloshing around, but I couldn't recommend that as even an empty bottle dropping on your toes is painful.