A gram of water is the mass of 0.001 litre (1 millilitre) of water  or pretty close to it.
http://wiki.answers.com/Q/How_many_liters_are_in_a...

Grams is weight. Liter is volume. But a liter of water has 1000 grams. Please text again!
http://www.kgbanswers.com/howmanygramsareina...

The specific gravity of water is 1.0 g/ml^3, so hence it takes 0.001 liters or 1.0
http://www.chacha.com/question/howmanylitersis...

1. Divide the number of grams in the gas by the gas's relative formula mass to calculate the number of moles of molecules in it. If you are calculating the volume of; for instance
http://www.ehow.com/how_8384659_calculatechemistr...
