ice nucleus

Water can also condense onto ice nuclei and then freeze.

Water will freeze at different temperatures depending upon the type of ice nuclei present.

In heterogeneous deposition, an ice nucleus is simply coated with water.

Ice nuclei cause water to freeze at higher temperatures than it would spontaneously.

Ice nuclei are fairly hard to come by.

The most common way to form an ice crystal, starts with an ice nucleus in the cloud.

For contact, ice nuclei will collide with water droplets that freeze upon impact.

If ice nuclei are introduced into this environment, the cirrus may instead form by heterogeneous nucleation.

Here are some examples of ice nuclei:

The Bergeron process relies on supercooled liquid water interacting with ice nuclei to form larger particles.

These fish must live well below the water surface, because they must not come into contact with ice nuclei (otherwise they would freeze immediately).

The Low Temperature Science Laboratory opened in 1935, and experiments continued with various materials for the ice nucleus.

If there are few ice nuclei compared to the amount of SLW, droplets will be unable to form.

An ice nucleus is a particle which acts as the nucleus for the formation of an ice crystal in the atmosphere.

Ice nuclei are very rare compared to that cloud condensation nuclei on which liquid droplets form.

The exhaust can also trigger the formation of cirrus by providing ice nuclei when there is an insufficient naturally-occurring supply in the atmosphere.

The previously compressed air expands and cools, creating ice nuclei on which crystallization of the atomized water takes place.

At such a temperature, the water droplets stay supercool as there are few ice nuclei to change them to ice crystals (see freezing rain).

A process whereby scientists seed a cloud with artificial ice nuclei to encourage precipitation is known as cloud seeding.

There is evidence that clouds, especially in the weather-making troposphere, contain biological ice nuclei that may play a key role in the formation of precipitation.

The particles that make ice nuclei are very rare compared to nuclei upon which liquid cloud droplets form, however it is not understood what makes them efficient.

Cloud seeding adds excess artificial ice nuclei which shifts the balance so that there are many nuclei compared to the amount of supercooled liquid water.

In warmer clouds an aerosol particle or "ice nucleus" must be present in (or in contact with) the droplet to act as a nucleus.

Many different types of particulates in the atmosphere can act as ice nuclei, both natural and anthropogenic, including those composed of minerals, soot, organic matter and sulfate.

Dust and soot particles can serve as ice nuclei, but biological ice nuclei are capable of catalyzing freezing at much warmer temperatures.