[quote=@Vec]
<Snipped quote by Yorutenchi>

everything you said, I mentioned when I was addressing Bai's questions. Of course, he can't control seawater. As said before, he can only change Solid > solid, liquid > liquid, gas > gas, plasma > plasma. As said also before, he can't change wooden items or change items to wood. As also said before, with the skill of the user varies the speed (how many items at a time) with which the user can change objects as well as the volume, mass and size of the changed object.

The thing with mass is that it will always be changed. Let's say you have Iron right? and you change it to gold. Gold is always heavier than iron so in a sense, you can't jus change an object and NOT also change its mass.
[/quote]

If you used 10 lbs of iron to make a 10 lbs of gold it would just look smaller but still bet he same mass. If you had a cup and changed it to something that is normally twice as heavy it would be half the size. Is this agreeable?