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645.50 miligrams is about one-two-hundred-fiftieth as heavy as a Puck (Hockey).
In other words, it's 0.0039598856414703 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 252.53254526530 times that amount.
(Ice hockey)
A standard ice hockey puck weighs between 155,922.37718750 miligrams and 170,097.138750 miligrams. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
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