4 experiências incríveis para fazer com água

Summary

In this engaging video, the presenter showcases four fascinating and easy-to-do science experiments using everyday materials. He demonstrates how the LG G8’s advanced technology, including 3D face scanning and infrared sensors, enhances the user experience. The experiments highlight the Marangoni Effect, where the tension of liquids changes with the introduction of detergent, causing mesmerizing movements. From moving oregano in water to creating intricate patterns in milk with food coloring, the presenter walks through these captivating demonstrations. The video also explores how various surfaces interact with liquids, all while using the cutting-edge features of the LG G8 to capture these effects in stunning detail.

Takeaways

• 😀 The LG G8S features a 3D face-scanning camera using infrared technology, allowing for secure and accurate face recognition in low light.
• 😀 The phone includes gesture controls, letting users interact with apps and media (like play/pause or volume adjustment) without touching the screen, useful when hands are occupied or dirty.
• 😀 The LG G8S provides a dual stereo speaker system, enhancing the sound experience with immersive audio, perfect for watching movies or listening to music.
• 😀 The smartphone’s triple camera setup includes a regular lens, wide-angle lens, and telephoto lens, providing versatility for capturing different scenes.
• 😀 The AI-powered 'Smart Selfie' mode can remove unwanted backgrounds in photos, letting users capture portraits in various environments without distractions.
• 😀 The camera uses a 3D map of the user's face to blur backgrounds in portrait shots, offering enhanced photo quality and depth perception.
• 😀 The Marangoni Effect is demonstrated through four experiments based on the impact of surface tension changes in liquids, such as the movement of pepper and oregano on water.
• 😀 Surface tension can be weakened by soap, and this concept is showcased in experiments where soap causes water (or other liquids) to move in unusual ways, such as pushing pepper or ink around.
• 😀 The Marangoni Effect can be visually demonstrated through the swirling of food coloring in milk after adding soap, showing how surface tension variations create motion.
• 😀 The final experiment uses pen ink to move a small cardboard boat across the surface of water, further illustrating how surface tension and ink interact.
• 😀 The LG G8S camera is used to capture slow-motion footage of a soap bubble experiment, showcasing its superior video capabilities and how the bubble moves due to varying surface tension.

Q & A

What is the Marangoni Effect, and how does it relate to surface tension?

The Marangoni Effect is a phenomenon where differences in surface tension cause movement in a liquid. This effect is particularly noticeable when a substance like soap weakens the surface tension of water, causing the liquid to move and creating interesting visual effects like the spreading of pepper or dye in water.

What role does infrared technology play in the LG G8 smartphone?

The LG G8 uses infrared technology in its Time of Flight sensor to create a 3D map of the surroundings. This allows for enhanced features like 3D facial recognition, improved portrait photography with background blur, and hand gesture control, even in low light conditions.

How does the LG G8’s hand vein detection technology work?

The LG G8’s hand vein detection works by using infrared light to detect the unique patterns of veins in your hand. The phone scans these patterns to authenticate and unlock the device, providing an extra layer of security.

How does soap affect the surface tension of water?

Soap weakens the surface tension of water by reducing the attraction between water molecules. This causes the liquid to move away from the soap, as seen in experiments where soap makes pepper, ink, or dye shift across a water surface.

Why do some insects and spiders walk on water?

Insects and spiders can walk on water due to the surface tension of the water. The surface tension acts like a 'skin' on the water, allowing small, lightweight creatures to stay on top without sinking.

What happens when soap is introduced to the surface of a liquid like milk or water?

When soap is added to a liquid, it disrupts the surface tension, causing the liquid to move in reaction. In the case of milk, for example, the soap creates swirling patterns by breaking the surface tension between the liquid and the dye added to the milk.

How do surface tension and the Marangoni Effect influence the movement of a cartolina boat in water?

The surface tension of water is altered when soap is introduced, causing the water to move in such a way that it pushes the boat in the direction of the soap. This movement is a direct result of the Marangoni Effect.

Why does pepper move away from the center of a plate when soap is added to the water?

Pepper moves away from the center of the plate because soap reduces the surface tension of the water in that area. The surrounding water with stronger surface tension pushes the pepper particles outward, creating the observed movement.

How does the Marangoni Effect contribute to the behavior of a soap bubble?

The Marangoni Effect is at play in soap bubbles, where differences in surface tension across the bubble's surface cause movement of the liquid. This can lead to iridescent patterns and changes in the shape or size of the bubble as surface tension varies across it.

What safety precautions should be taken when performing the pen ink and surface tension experiment?

When performing the pen ink and surface tension experiment, it's important to be cautious with ink, as it can stain clothing and surfaces. Make sure to conduct the experiment in a controlled area, preferably on a washable surface, and avoid using ink near sensitive materials or fabric.