Water properties

1,350 views

Published on

Published in: Education, Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,350
On SlideShare
0
From Embeds
0
Number of Embeds
836
Actions
Shares
0
Downloads
20
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Water properties

  1. 1. WATER PROPERTIES
  2. 2. Water has unique properties • It is made of molecules. • Each molecule is made up of one atom of oxygen and two atoms of hydrogen.
  3. 3. The main properties • Density and dilation. The density of the ice is lower than the density of the water. Ice floats on water. • A powerful solvent. It can dissolve many solvents. – Can water dissolve grease, oil? – Can water dissolve gases such as oxygen and carbon dioxide?
  4. 4. • It has a high specific heat. Water does not get hot or cold easily. – Water is an ideal substance to absorb and accumulate heat. – Water moderates the Earth´s climate. • • • • Cohesion Adhesion Surface tension Capillarity
  5. 5. Adhesion and cohesion • Cohesion: Water is attracted  to water. • The water drop is composed  of water molecules that like  to stick together Adhesion: Water is attracted  to other substances
  6. 6. • Water drops on pine needles, showing the  effects of gravity, adhesion, and cohesion on  water. Cohesion is seen in the actual water drop—the water molecules stick to each other, forming a drop. Property of gravity, which is causing the water drops to roll  along the pine needle.  Property of adhesion is holding them, at least for now, to the  pine needle.
  7. 7. • Cohesion makes a water drop a drop – The drop seems to have a "skin" holding it  – It turns out that this surface tension is the result  of the tendency of water molecules to attract one  another. 
  8. 8. Capillarity action • Capillary action seen as water climbs to different levels in glass tubes of different diameters. • The movement of water within the spaces of a porous material due to the forces of adhesion, cohesion, and surface tension.
  9. 9. • Plants and trees couldn't survive without capillary action (adhesion and cohesion forces)
  10. 10. Surface tension • Floating paper clip made of steel The high surface tension helps the paper clip - with much higher density - float on the water. • the cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
  11. 11. • Walking on water: Small insects  such as the water strider  (pondskater) can walk on water  because their weight is not  enough to penetrate the surface.
  12. 12. • Don't touch the tent!: Common tent materials  are somewhat rainproof  • But if you touch the tent material with your  finger, you break the surface tension and the  rain will drip through.

×