600ml added to 1.9l = 601.9
3.785 litres per gallon. 600ml is about 1 and 1/4 us pints.
2oz
It depends on the liquid. At room temperature and sea level 600ml of water weighs 600g. 600g is 1.3lbs. If your 600ml is denser than water then it'll be more, if it's less dense it'll be less.
The only way to know is to weigh it. The mass of two apparently identical flasks is quite variable.
600ml
That is 2.646 cups.
they are the same
No
It depends on what's being measured. For water, 1cc = 1ml = 1g. Therefore, 125ml of water is 125g.
99.9999999%
31.25 ml