Magic sand - scientific experiment #7.07 from Grains de bâtisseurs

Capillary cohesion
[ Experiment 7.07] Magic sand
- Ordinary sand is hydrophilic: water dropped onto its surface is sucked in between the grains.
- The surface of the blue sand was chemically treated to repel water: it is hydrophobic. Water dropped on its surface forms beads which do not mix with the sand.
- Ordinary sand poured into the water disperses and the water becomes cloudy.
- When hydrophobic sand is poured into the water, it remains aggregated and forms small masses. This sand has cohesion in water and can be modelled to form sand piles.
- The situations between these two sand piles are reversed. In the first case, sand grains surrounded by a film of water in the air are held together. In the second case, sand grains surrounded by a film of air in the water are held together. Three phases are needed to provide cohesion: a solid phase (grains), a liquid phase (water) and a gaseous phase (air).
- When the ordinary pile of sand paste is plunged into the water, air bubbles escape. The gaseous phase disappears along with cohesion.
- When the hydrophobic sand piles are removed from the water, only grains and air remain. The liquid phase disappears along with cohesion.
#sand #construction #scientificExperiment
-
Licence Creative Commons : BY + NC + ND
Co-producción : CRAterre-ENSAG, amàco, les films du lierre
-
SUBSCRIBE
→ th-cam.com/channels/eli.html...
Newsletter
→ eepurl.com/-yc3r
-
FOLLOW US ON...
Website → www.amaco.org
Facebook → / atelier.amaco
Instagram → / atelier_amaco
Linkedin → / amàco
Twitter → / atelier_amaco

[@mrfoxvousexplique9716]

Très belle vidéo.

[@djeggapalaceminbon8176]

Vraiment très intéressant je suis fascinée par ce que vous faites. J'aimerais venir me former chez-vous. Comment faire ?

[@bruceh9843]

😞 p̶r̶o̶m̶o̶s̶m̶