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That depends on what substance is in the 591 ml.

If it's 591 ml of air, there are only a few grams of mass in it.

If it's 591 ml of water, there are close to 591 grams of mass in it.

If it's 591 ml of gold or lead or rocks, there are many many grams of mass in it.

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15y ago

What else can I help you with?