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An ounce is a unit of weight/mass

A millilitre is a unit of volume.

The two units can not be equated without knowing the density (mass per unit volume) of the substance being measured.

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Wiki User

7y ago
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Wiki User

14y ago

There are about 0.033 US fluid ounces in one mL. So, multiply mL by 0.033 to get US fluid ounces:

  • 640 mL x 0.033 = about 21.641 US fluid ounces
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Wiki User

15y ago

21.6 fluid ounces

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AnswerBot

4mo ago

About 2.7 glasses of 240 ml each.

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Wiki User

14y ago

640 mL is about 21.641 US fluid ounces.

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Wiki User

14y ago

640 mL = about 21.641 US fluid ounces.

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Wiki User

13y ago

2 1/2 glasses of water.

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Anonymous

Lvl 1
4y ago

2.7

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Q: How many glasses is 640 ml of water?
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