Watch carefully at the cup.
Watch the colour change!
This never fails to amaze my students when I do this experiment. To them, it’s magic. To me, it’s Science. It’s a good tool to teach heat gain and heat loss. What they see, they are able to connect what they learn in real life.
Water in its 3 states of matter. Versatile experiment to teach p4 or recap for my upper level students. Easy to understand. I used this set to teach for the whole day for my different age groups.