9 EXPERIMENTOS FÁCILES | CIENCIA DIVERTIDA

Scientific Concepts / Phenomena (from the 9 Home Experiments)

1. Surface tension (a liquid “film” holding weight)

   • A card placed over glass filled with water can hold several coins due to water’s surface tension.

2. Capillary action / adhesion of water to ink (ink drawing lifts)

   • Drawing with a thick whiteboard/dry-erase marker, then slowly adding water, causes the drawn figures to begin lifting as the water interacts with the dried ink layer.

3. Pressure and trapped air preventing flow (inverted bottle “no-drip” behavior)

   • Filling a bottle with water and placing a napkin on top, then turning it upside down, results in no drops falling because air pressure trapped in the setup resists water entering the napkin opening.

4. Optical illusion / color-based image perception

   • Making colored drawings and inserting a card/drawing through a bag (tracing an outline onto the bag, etc.) to create a simple visual trick.

5. Diffusion / mixing in water (colors “disappearing”)

   • Putting a drawn image in a container of water leads to the visible disappearance of color as dyes disperse through the water.

6. Air pressure and barrier effect preventing wetting

   • A crumpled, fully dry paper towel placed inside a glass and submerged stays dry; air trapped in the glass creates pressure that prevents water from entering and wetting the paper.

7. Non-Newtonian fluid behavior (cornstarch “solid” vs. liquid)

   • Cornstarch mixed with water (and food coloring) behaves like:
     • Solid-like when pressure/force is applied
     • Liquid-like when there is no pressure (it flows)

8. Capillary siphon / fluid transfer via straw geometry

   • Using a modified straw (cut so the ends point upward) inserted into water, with finger-covered holes to control flow, water transfers from one glass to another.

9. Refraction of light (apparent arrow direction changes with water)

   • Arrows behind a glass appear to point in one direction in air, but change direction once water is added, illustrating light refraction at the air–water boundary.

10. Thermal stratification and density (hot vs. cold water layering)

    • Placing a card separating warm and cold water layers prevents immediate mixing:
      • Hot water is less dense, stays on top
      • Cold water is more dense, settles below
    • When the card is removed carefully, the layers largely remain distinct due to density differences.

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Researchers / Sources Featured

• No specific researchers or external scientific sources are named in the provided subtitles.