When boiling water is thrown into the air, the water molecules undergo several changes. First, as the water is heated, the energy from the heat causes the water molecules to gain kinetic energy, which makes them move faster. This increase in kinetic energy breaks the hydrogen bonds between the water molecules, causing them to transition from the liquid state to the gaseous state, forming water vapor. As the boiling water is thrown into the air, the water vapor rises due to its lower density compared to the surrounding air.