Water molecules freeze in a hexagonal pattern and the molecules are further apart than they were as liquid water. Water is unusual because its molecules move further apart when it freezes. The ...

For the first time, Northwestern University scientists have watched water molecules in real-time as they prepared to give up ...

Heating a substance makes the molecules move faster. Cooling a substance makes the molecules move slower. Students see a video of water freezing and then melting. Students warm butter until it melts ...

Salt and other solutes (substances that dissolve) reduce the freezing point because they disrupt the crystal structure of ice and reduce the concentration of pure water. At 0°C, the molecules in ...