For a grill, when the flames begin to flutter and go out. The gas tank will become much lighter. Not exactly a scientific approach but it works.
With a standard propane tank you will know when it is out because it will stop feeding whatever instrument you have it attached to. If you want to be able to predict when this will happen, you can buy a gas gauge. The gauge will be able to tell you the percentage of propane left in the tank. If you don’t want to spend the $15 on one, simply compare the weight of what your tank was when you bought it new. The propane inside the tank makes it remarkably heavy, while when it is drained a child should be able to lift it up.
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