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Molecule
The smallest physical unit of an element or compound.

Polarity
The uneven sharing of electrons in the water molecule, making the hydrogen end slightly positive and the oxygen end slightly negative.

Hydrogen Bond
A weak bond formed between water molecules due to water's polarity. The positive end of one water molecule is attracted to the negative end of another.

Cohesion
Water molecules 'stick together' due to hydrogen bonds.

Adhesion
Water molecules 'stick' to other molecules due to hydrogen bonds.

Surface Tension
A 'skin' on the surface of water due to cohesion.

Capillary Action
The tendency of water to climb up small tubes due to adhesion and cohesion.

Meniscus
The curve on the surface of water in a tube due to adhesion.

Density
Liquid water has a density of 1mg/cm3 but ice is 0.9mg/cm3. Ice floats on water because it is less dense.

Specific Heat
The amount of energy needed to raise the temperature of a
substance. Water has a high specific heat, which means it takes a lot of energy to raise the temperature of water.
