Como fazer GELO INSTANTÂNEO sem QUÍMICA

Summary

In this video, the presenter demonstrates how to make instant ice using only water, explaining the science behind it through the concept of supercooling. By carefully chilling mineral water to just below freezing point without freezing, the water remains liquid. A simple disturbance, like adding ice, triggers the water to freeze instantly. The presenter also shares related experiments involving chemicals like sodium acetate and sodium thiosulfate. The video offers a fascinating look at a natural phenomenon and provides a fun, easy experiment that viewers can try at home.

Takeaways

• 😀 The video demonstrates how to create instant ice at home using only water, with no chemistry tricks involved.
• 😀 The experiment requires supercooled water, a state where water is cooled below its freezing point without turning into ice.
• 😀 To achieve supercooling, the water must be pure and free from impurities that would trigger crystallization.
• 😀 The water must be placed in a freezer and allowed to cool to a precise temperature just before freezing, typically around 1 hour and 20 minutes in the test freezer used in the video.
• 😀 The experiment works by disturbing the supercooled water, which causes it to instantly freeze when it comes in contact with ice or impurities.
• 😀 The phenomenon demonstrated in the video is called 'supercooling' or 'undercooled' water, where the liquid remains in a liquid state below its freezing point.
• 😀 The process of making supercooled water is delicate and requires the water to be undisturbed in the freezer to avoid premature freezing.
• 😀 Supercooled water can be triggered to freeze instantly by the slightest disturbance, like tapping the container or introducing a small ice cube.
• 😀 A similar supercooling effect occurs with beer, where bottles left in the freezer might remain liquid until disturbed, causing them to freeze suddenly.
• 😀 The experiment with water in the video is contrasted with previous experiments with sodium acetate and sodium thiosulfate, which also demonstrate crystallization in unique ways.
• 😀 The video encourages viewers to experiment with these principles at home, but with caution, and links to other similar experiments on the Manual do Mundo channel.

Q & A

What is the main concept behind the experiment described in the video?

The main concept of the experiment is to show how water can freeze instantly without using any chemical tricks, just by utilizing water and a special physical phenomenon called supercooling.

What is supercooling or 'sobrefusão' in the context of the video?

Supercooling is a phenomenon where water is cooled below its freezing point (0°C) without actually freezing. This occurs when the water is pure and not disturbed, allowing it to remain in liquid form even below freezing temperatures.

Why is it important to use mineral water instead of tap water in this experiment?

Mineral water is preferred because it contains fewer impurities compared to tap water. Impurities can disturb the supercooling process and cause the water to freeze prematurely.

How do you know when the water is in a supercooled state?

The water is in a supercooled state when it has been chilled just below its freezing point but remains liquid. A key indicator is that the water appears to be almost frozen but is still visibly liquid when checked.

What method is used to trigger the freezing process once the water is supercooled?

The freezing process is triggered by introducing a small disturbance, such as placing a piece of ice into the supercooled water or tapping the container lightly. This initiates the crystallization and causes the water to freeze instantly.

What role does the temperature and time play in the experiment?

The temperature needs to be precisely controlled, and the water must be chilled for a specific amount of time (usually about 1 hour and 20 minutes in this experiment) until it is just on the verge of freezing. If left too long, it will freeze naturally before the experiment can be conducted.

Why does the water freeze instantly upon disturbance?

The water freezes instantly because, in its supercooled state, it is in a delicate balance just below freezing. When disturbed, the molecules immediately begin to organize into a solid, causing the water to freeze rapidly.

How is the phenomenon demonstrated in everyday life outside of the experiment?

A common example is when a bottle of beer or soda is left in the freezer for too long. If the bottle is removed and disturbed (such as by tapping it), the liquid may freeze instantly.

What is the difference between the water-based supercooling experiment and the one involving sodium acetate or sodium thiosulfate?

The difference is that sodium acetate and sodium thiosulfate are chemicals that can also be supercooled and remain in a liquid state longer than water. They are more stable in supercooled form, allowing for more controlled experiments, whereas water is more sensitive and can freeze almost instantly when disturbed.

Why does the experiment require such careful handling of the water?

Careful handling is necessary because any movement or impurity in the water can cause it to freeze prematurely. The key to success is keeping the water undisturbed and pure to allow it to reach the supercooled state without freezing.