Prepare wood, plastic toy, stone, cucumber or any other vegetable, iron
float/sink: Since the water is here, we will add some more of it and check out if the (object) floats or sinks. What do you think will happen to the (object) when I will put it in the water? Make an assumption. Say: Let’s test it now. Put the (object) in the water. Describe what you see: the (object) floats (sinks). It means that density of the (object) is lower than the density of water (or higher if sinks)
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