Tintins showed a high interest in water and problems we have been experimenting lately. Today we have been talking about how could we measure water in order to prepare an experiment. We wanted to know if sea water evaporates and if so, if we could separate water from salt. One of them came up with an idea: we could pour water into a container and then cover it with another container leaving some room for a tray. Her theory is that we are going to get fresh water and salt is going to remain in the central container. One of them pointed out we could add mark with a feltip pen the water level. By  doin it so, we would be able to measure how much water have evaporated in some time.