Experiments - physical changes Experiments and ideas: Physical changes Can the three states of water exist together in a test tube? Is steam different from water vapour? How do clouds form? Water passing through a beaker? Examine your breath! Boil water in a paper cup. How to pick up an ice cube with string and salt? To sublime or not to sublime! That is the question. Does water boil past 100ºC? Observe a candle burn How to make a heat pack. (Sodium acetate) ‹ Matter up Physical change ›