Either. A tin could described as 0.4 litres or 400 millilitres.
In the UK they are often labelled in terms of the met mass (or weight).
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Unless you're shopping at some super-Costco, it should be in milliliters.
Yes, what else?
This depends on the size of the soup bowl in question. The capacity could be measured using either fluid ounces, cups, or pints.
Ounces (Avoirdupois ounces, not fluid ounces. Fluid ounces measure volume, not mass.)
that depends on the can..and the soup!