In today's activity, the students investigated the question, "Is the density of all water the same?" Using hot, red water heated up in a coffee urn and ice-cold, blue water stored in a cooler, the students tried to determine if one or the other was more or less dense. For the investigation, they had 2, different sized test tubes and a long, plastic pippet at their disposal. The kids tried putting the hot water into the test tube first and then added the cold water. They then tried the opposite. After a lot of experimenting, they discovered that the hot water was "lighter", or less dense than the cold water.