Tell how to use volume then say what to do. Try to be as simple as possible.
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volume is how much the object takes up
Density = mass/volume Mass = (density) x (volume) Volume = mass/density
You find the height, length and the width and you multiple them together then you will get the answer.
You don't have to find the volume ! If gas is put into a closed container, it fills it. The volume of gas in a one liter tank is one liter.
Show them a flat piece of paper and explain that it has size - high by wide by no volume, turn it sideways to show this. For volume, show them a thick book, size again high by wide by now it has depth = volume.