Science experiment which surprised everyone.....

Today I am telling about the scientific experiment which surprised everyone. Let me take hot water in a long glass pipe and cold water in another. Now to differentiate between the two, I will add blue colour to hot water and red colour to cold water. Now I will make blue colour pipe upside down on red colour pipe. Meaning I am mixing cold water to hot water. Now we get surprised by seeing that blue coloured water is resting on red coloured water !!!! Means hot water layer is above the cold water. What is the meaning of this??????? ????? ?????? Water gets expand when heated. So density of hot water is now increased. Hot water is less denser than cold water. Hence it will stay at the top when we mix hot water with cold water. That's why we see two distinct layers of colours. Now I will do vice a versa . Now I will mix cold water to hot water. Means mixing red coloured water to blue coloured one. Now we will see a different colour throughout the pipe!!! Now what is the meaning of this???? ?????? ????? As I said earlier, cold water is denser than hot water. So when we mix cold water to hot water then cold water goes down of the pipe being denser. Means now both the coloured waters mix with each other and hence we get a new coloured water. Summary ---- Hot water is less dense than the cold water . So when we keep cold water below and hot water above , the lesser dense hot water is already on top of cold water . So we will see two different layers of water . Bottom is of red colour ( cold water ) and above that blue colour ( hot water ). Now when hot water is below of cold water , now hot water molecules start moving upwards as they are lighter than cold water molecules . This movement of hot water molecules upwards is called convection. At this time , there will be the mixing of both hot and cold water molecules . As we have coloured them , there will be the mixing of blue and red colour . Thus , we see the mixed colour , magenta colour water .