INTRO TO MARINE SCIENCE - Lecture 6

Density and Energy

Dissolving salt ________ the density of water

increases

________ and colder water can sink through ___________ fresher and/or warmer water.

Saltier, colder

What happens when you add salt to water?

• density increases

• elevated boiling point

• no fixed freezing point

• increased viscosity

• increased osmotic pressure

What is water called?

universal solvent

Conduction

molecular transfer of energy (short distances)

• cold spoon in hot chocolate — spoon turns hot

Convection

density driven movement of material due to differences in temperature

• why hot stuff rises and cold stuff falls

• magma, water, air

Radiation

transfer of energy in absence of a medium

• sun transfers heat to earth through vacuum of space

Absorption

water molecules absorb the energy

Scattering

light energy bounces off things in the water

Attenuation (filtering out)

red wavelengths (long wavelengths)

• blue and green is not filtered out as fast

• diminishment of light with depth