At 4 deg C and at a pressure of 760 mm of Mercury, when water is at its highest density, 1000 grams of water will occupy 1000.028 mL. At all other temperatures (pressure = one atmosphere), it will occupy a greater volume.
At 100 deg C it will occupy 1043 mL.
However, most people will say 1000 grams of water equals 1000 mL.
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For pure water at 25 oC and STP 1mL = `1 gram
Hence for 1000gram = 1000 mL=1 litre.
There is one gram per ML of water, and 1000 ML in a liter. There are 2,000 grams or two kilograms in two liters of water.
Water has a density of about 1 (or 1000, depending on the units used...) meaning that every ml of water has a mass very close to 1 gram.
Well, saline is almost totally water, so... 1000 ml = 1kg of water 1 kg = 2.2 lbs so 1000/2.2 = ~454 ml.
The answer depends on the temperature, but at room temperature (20 deg C), 100 ml of water would have a mass of 99.82 grams.
If you want to convert that into liters, divide the number by 1000.