TR3.5

Properties of Water

Houjun Liu 2021-09-27 Mon 12:00

1 Properties of water

1.1 Cohesion

  • Individual molecules held up well +
  • Strong surface tension

1.2 Adhesion

  • Water attracts other molecules, and it stick to water pretty well
    • If we make water molecules touch another molecules, it will stick to it and start moving
    • Think: a straw — a thin straw could draw up water without additional pressure just by water working its way up using adhesion
  • This is how we make "xylum" and "Pholem" happen
    • Water's adhesive force — and adhesive force only — is how water travels upwards from a tree
    • Given that some trees are, em, pretty tall, this means that the capillaries that the water travel in must be very small
    • A Pico-Gauge could be used to measure the pressures within the phorlem

1.3 Water…

  • is wet => Strong tetrahedral H-Bonds
  • is sticky => Has both Cohesive and Adhesive Properties
  • have a high specific heat capacity.
    • Strong bonds
    • Resistant to change

1.4 Water's Universal Solvent Properties

Water has high solubility

  • Many things could dissolve in water
  • Makes chemical processes quite easily
  • Quite versatile — could dissolve stuff easily

1.5 Hydrophillic + Hydrophobic Effects of Water

Screen Shot 2020-08-26 at 3.07.53 PM.png

Figure 1: Screen Shot 2020-08-26 at 3.07.53 PM.png

  • In hydrophillic senarios, water will to "puddle out" ("Wetting") — adheses to the surface
  • In hydrophobic senarios, water leverage its cohesion properties to create spheres