Freezing Point of Water

Front

What is the freezing point of pure water at sea level?

Back

0ºC (or 273K)

Front

What happens to the freezing point of water if the surrounding pressure is increased above sea level?

Back

The freezing point decreases.

Front

How can the freezing point of water be lowered?

Back

By adding anti-freeze (glycol).

Front

What happens to water molecules when water freezes?

Back

They are packed together to form a solid.

Front

By what percentage does water expand when it freezes?

Back

10%.

Front

Why do frozen pipes burst?

Back

The water inside freezes and expands, pushing the pipe walls outwards.