How many milliliters would you use if you needed 6.81 g?

Answer 1

This is impossible to answer unless you know what substance we are talking about. The same mass of different substances occupies different amounts of space. The mass of 1 centimetre cubed of a substance is called its density. Temperature also matters as most substances become less dense when you heat them.

If you are talking about water at room temperature, one centimetre cubed has a mass of approximately 1 gram. A milliltre is the same as 1 cm cubed. Thus you would use 6.81 ml in your example. For other substances you'd have to divide 6.81 by the density.

Answer 2

6.6 pounds of water is 2,993.7 ml.