Where is the freezing point of distilled water?

Normally, the freezing point of water is 0° C. After all, our temperature scale is based on this value. Whether it is at a different value with distilled water, and why this is so explained in detail this post.

Freezing of water

Water can take on three different states of aggregation:

  • liquid as liquid water, as we know it
  • gaseous as water vapor
  • stuck as ice

Under different environmental conditions, water changes the transition temperatures from one state to another. For example, pressure or reduced gravity play a role, and even high-altitude air makes it impossible for water to boil.

On the other hand, under special conditions, water can be overcooled until it freezes. In some cases, temperatures of up to -23° C are possible, but the water does not freeze; under pressure this point is often much lower.

Hot water usually freezes faster than cold water. This is called the Mpemba effect. Magnetic fields also influence the melting point of ice.

But the water itself also ensures that the freezing and boiling point of the water shift.

Freeze distilled water

Distilled water generally freezes only at temperatures of -70° C or even lower. The higher the purity of the water, the lower the freezing point is.

As with other types of water, the freezing point may be different due to different environmental conditions and physical conditions. Pressure, magnetic fields and oxygen content of the air also affect distilled water.

When frozen, distilled water forms a different crystal arrangement than ordinary water. It can quickly freeze spontaneously in certain places, but only one part of the water freezes, the other remains liquid.

The numerous anomalies and the dependence on environmental conditions thus make it impossible to specify an exact freezing point for distilled water. However, it can be assumed that the purer a water is, the lower the freezing point is and the higher the supercooling ability is.

Tips & Tricks

The freezing of distilled water is not necessary to maintain its purity. Storage in a plastic canister under the exclusion of air is sufficient.

Video Board: Supercooled Water - Explained!