very interesting! though I have to agree with the comments regarding some of the visual aids. I am not sure how to compare fruit juice and hockey put... As DJHIXSON said, using something familiar (and that you always have with you) like the palm of your hand, and so on would be most useful.
I'm not sure how you can indicate a liquid to be about the size of a hockey puck, I mean how can you mentally put those two items together and say "oh ok... this glass of juice is the same size as a hockey puck" ????
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