Nucleation is the process by which ice crystals form in water. It occurs when water molecules come together in a specific arrangement that allows them to form bonds with each other and form a solid crystal structure. Preventing nucleation can therefore prevent water from turning into ice. This can be achieved by:

- Additives: Adding certain additives to water, such as antifreeze or salt, can disrupt the formation of ice crystals and prevent nucleation from occurring.

- Vibration: Applying vibrations or ultrasound to water can also disrupt the formation of ice crystals and prevent nucleation.

- Magnetic fields: Exposing water to magnetic fields has also been shown to inhibit nucleation and prevent water from freezing.

2) By reducing the temperature slowly

The rate at which water freezes can affect whether or not it turns into ice. If water is cooled slowly, it has more time to form crystals that are stable and less likely to melt. However, if water is cooled quickly, it may not have enough time to form stable crystals and may instead form unstable crystals that are more likely to melt. This is why supercooled water can remain liquid at temperatures below its freezing point.

3) By applying pressure

Applying pressure to water can also prevent it from turning into ice. This is because pressure increases the density of water, which makes it more difficult for ice crystals to form.

4) By using a hydrophobic surface

A hydrophobic surface is a surface that repels water. When water is placed on a hydrophobic surface, it forms small droplets that have a high surface tension. This surface tension prevents the water droplets from freezing.