Table of Contents
Table of Contents
Title: 5.8 Transmission ofEnergy (In Oceans)
Page #: 52
Date: 12/17/12
Title: 5.8 Transmission ofEnergy (In Oceans)
Page #: 52
Date: 12/17/12
Objective
Objective
•Students will observe the effect of salton the density of water.
•Students will be able to compare andcontrast the three ways by which heatis transferred.
•Students will observe the effect of salton the density of water.
•Students will be able to compare andcontrast the three ways by which heatis transferred.
Words of the Day
Words of the Day
•Efficient: Producing directly with aminimum of waste.
•Efficient: Producing directly with aminimum of waste.
Effect of Salt on Density
Effect of Salt on Density
•Density of freshwater = 1 g/cm^3
•Density of saltwater = 1.0278 g/cm^3
•When salts are dissolved in water, thedensity of that water increases becausesalts have a higher density than water.
•Density of freshwater = 1 g/cm^3
•Density of saltwater = 1.0278 g/cm^3
•When salts are dissolved in water, thedensity of that water increases becausesalts have a higher density than water.
Effect of Salt on Density
Effect of Salt on Density
Saltwater
Freshwater
Transmission of Energy(In Oceans)
Transmission of Energy(In Oceans)
•Energies: Heat, Light, Sound
•Heat: 3 ways that it may beconducted
1.Conduction
2.Convection
3.Radiation
•Energies: Heat, Light, Sound
•Heat: 3 ways that it may beconducted
1.Conduction
2.Convection
3.Radiation
Transmission of Energy(In Oceans)
Transmission of Energy(In Oceans)
1.Conduction: A molecular process.
•Heat that is applied to one point on amaterial will spread as molecules start tomove faster and bump into one another.
•Occurs in metals (conductors)
•Water is a bad conductor.
1.Conduction: A molecular process.
•Heat that is applied to one point on amaterial will spread as molecules start tomove faster and bump into one another.
•Occurs in metals (conductors)
•Water is a bad conductor.
Transmission of Energy(In Oceans)
Transmission of Energy(In Oceans)
2.Convection: Driven by density.
•Hot water is less dense than cold water.
•Rising hot water creates a current.
•When hot water gets far away from theheat sources it cools and falls backtowards the heat again.
2.Convection: Driven by density.
•Hot water is less dense than cold water.
•Rising hot water creates a current.
•When hot water gets far away from theheat sources it cools and falls backtowards the heat again.
Transmission of Energy(In Oceans)
Transmission of Energy(In Oceans)
3.Radiation: The direct transmission ofheat from its energy source.
•Does not require a medium.
•Sun provides Earth and ocean’s withradiation.
3.Radiation: The direct transmission ofheat from its energy source.
•Does not require a medium.
•Sun provides Earth and ocean’s withradiation.
Transmission of Energy(In Oceans)
Transmission of Energy(In Oceans)
Convection is the most efficient methodof distributing heat through water.
Radiation impacts from above, onlywarms surface water.
Conduction is not effective in water.
Convection impacts from below. Hotwater rises, creating a convection cell.
Convection is the most efficient methodof distributing heat through water.
Radiation impacts from above, onlywarms surface water.
Conduction is not effective in water.
Convection impacts from below. Hotwater rises, creating a convection cell.
Transmission of Energy(In Oceans)
Transmission of Energy(In Oceans)
Oceans are heated from above by Sun’sradiation.
•Some heat is transferred down byconduction, most is lost by:
1.Conduction of heat from surface water to air.
2.Evaporation - Transfer of water vapor toatmosphere.
Warms atmosphere from below.
Creates convection currents in atmosphere.
Oceans are heated from above by Sun’sradiation.
•Some heat is transferred down byconduction, most is lost by:
1.Conduction of heat from surface water to air.
2.Evaporation - Transfer of water vapor toatmosphere.
Warms atmosphere from below.
Creates convection currents in atmosphere.
