Sugar because it's the lightest! I'm doing my science fair project on what dissolves in water faster and it's due on friday and I was supposed to start it 6 weeks ago have any advise??????
The only coffee that dissolves in HOT water is instant coffee. Salt takes time to dissolve. Therefore sugar is the answer. It is the lightest of the three. However, sugar will not dissolve in cold water, as neither will instant coffee.