Towards the end of the year, the weather in Seville starts to become slightly milder. In October, the sun shines for at least 7 hours per day but brace yourself for rain as there are on average 6 days of rainfall during the month.
When a molecule has no dipole moment, like CO2, then it is nonpolar. When a molecule has a dipole moment like water, then it is polar. This polarity business is very important. Polar molecules are like little magnets, with a positive end and a negative end, and they interact with each other through magnetic attractions.
Hydrogen bonding is bonds between hydrogen and either fluorine, oxygen, or nitrogen. Dipole-dipole bonding is when there is bonding between molecules because the positive element of one molecule bonds with negative element of the other molecule.