QUOTE(customer2 @ Nov 20 2010, 12:59 AM)
but the answer given is volume increase , density decrease .. from the times physic
i know why d , when ice > water , temperature increase ... charles law= volume increase , volume is inversely proportional to density
Wrong concept. First, Charles's Law does NOT apply here. When Ice turns into liquid there's a decrease in volume.
You cannot use charles's law when there involve a change of state in between like liquid > ice.
General Knowledge:
1) When water turn into ice, there's an increase in volume.
2) Hence, a decrease in density. (P.S. refer Bio form4 textbook chapter 4)
Haven't you all done a question about a floating ice cube on water(with part of it above water surface)? when the ice cube melts, water level will still remains the same. This is because liquid have higher density + lower volume than the same mass of ice.
Refering to the question above, I have no idea why this happens unless youre heating the water well above 0 degree (say like heating it until 80). Then the answer is possible.
Btw, did I ever mentioned? I am a SPM student as well