Thanks to the video "Experiencing density with hot and cold water", your students will be able to observe the difference in density between a warmer water and the other.
20 minutes / 15 students
Type of content: experimental activity to be done in class
Materials required: a tray (or use a sink if one is nearby), two identical glasses, some cardboard, two types of food colouring, very cold water, hot water
Follow step by step the experimental protocol on this video to introduce to your students the notion of difference in density between cold and hot water.
Cold water is more dense than hot water and will sink to the bottom of the glass. This is what happens in the ocean. As the cold-water particles are more compact, the water is more dense and ends up at the bottom of the ocean.
To carry out this activity, you also have a written document presenting the steps and a discussion section.