Chemical and physical properties of sea water

This week in marine biology class, we talked about water and its physical and chemical properties. We learned that water is most dense at cold temperatures, and that cold air sinks and hot air rises. Air pressure is higher at lower sea levels, and when the pressure is strong enough, it could kill. When water condensates, energy is released, and when water evaporates, energy is being absorbed. A water molecule has a positive hydrogen end, and a negative oxygen end. Since the oxygen molecule is stronger and has more electrons, it pulls all the electrons towards it making the water molecule polar because the share of electrons is uneven. Sea water has many other components in it like salt and other elements so sea water has a salinity level. Sea waters get either heated or cooled depending on the type of wind that flows by it. Different winds carry water and air to different areas at different temperatures making all sea water different in some way.