Freezing Point of Water

What Is the Freezing Point?

Water turns from a liquid into a solid at a special temperature called the freezing point. For water, this is exactly 32°F (degrees Fahrenheit) or 0°C (degrees Celsius) under normal conditions. At this temperature, liquid water becomes solid ice!

What Happens to Water Molecules?

Water is made of tiny particles called molecules. These molecules are always moving around when water is a liquid. As the temperature drops, the molecules slow down. At the freezing point, the molecules move so slowly that they lock into a neat, crystal pattern and form solid ice.

Freezing Point Is Like Water’s Bedtime

Think of the freezing point as water’s bedtime. At 32°F (0°C), the water molecules get so tired and slow that they stop running around and “lie down” in an organized ice crystal pattern.

Melting Point and Freezing Point

The melting point of ice is the same as the freezing point of water. This means that ice melts and water freezes at 32°F (0°C). The process works both ways!

Why Does the Freezing Point Matter?

Knowing about the freezing point is important in real life. Weather reports warn people when temperatures are at or below freezing, so drivers can be careful about ice on roads. Farmers protect plants from frost. In winter, pipes in homes can burst if water inside them freezes and expands.

Water’s Wacky Fact

Unlike most liquids, water expands (gets bigger) when it freezes. That’s why ice floats in water and frozen water bottles bulge!

Everyday Connections

Ice skating rinks keep the ice at just the right freezing temperature. Freezers are set colder than 32°F. Many animals survive winter because ice floats, making a safe layer over pond water.

Try It Yourself!

Put a cup of water in the freezer. Use a thermometer to check as it cools. Watch what happens at 32°F (0°C)!

Interesting Fact: Some fish and frogs can live all winter in frozen ponds because the ice floats and keeps the water underneath from freezing solid!