Convection The driving force Before you can understand convection, you need to remember density! Density = Mass Volume What happens if the volume increases.

Slides:



Advertisements
Similar presentations
Moving in the right circles
Advertisements

3 Types of Heat Transfer.
3 Types of Heat Transfer 6th Grade.
Movement in the layers
Earth Science 9.4 Mechanisms of Plate Motion
Convection in Air Investigation 5, Part 3
Air Pressure.
Global Winds & Ocean Currents
atmosphere at a given time with respect to heat, pressure,
Convection and the Mantle
Heat Transfer Heat always moves from a warmer place to a cooler place. Hot objects in a cooler room will cool to room temperature. Cold objects in a warmer.
Oceans Video Video.php?video_id=173915&title=E xploring_Oceans&vpkey=
Convection Currents and the Mantle How is heat transferred? What causes convection currents?
Transferring Thermal Energy Chapter 9 Section 3a.
Heat in the CH 15 Prentice Hall p CH 15 Prentice Hall p At ppt Atmosphere.
Gas, Pressure, and Wind. Gases Recap - Nitrogen (78%), Oxygen (21%), Other and H2O (1%). Gases, like matter, have mass and are affected by gravity The.
Chapter 1 Section 2: Convection Currents and the Mantle
Lesson 3 Convection and the Mantle. Vocabulary radiation - the transfer of energy that is carried in rays like light convection - heat transferred by.
Convection, Conduction, and Radiation Heat Transfer.
CONVECTION CURRENTS A quick review using white boards.
Heat Transfer What do you know about heat transfer?
Investigation 8 part 2 What Causes Wind
Weather & Water Investigation 8
Convection Convection in Water Investigation 5, Part 2.
Energy Transfer in the Atmosphere (51) Energy is reflected back into space by clouds, particles, and Earth's surface. Some is absorbed by the atmosphere.
Heat energy flows from warmer to cooler areas Lesson 1.3 You will learn: How heat is transferred in matter; How the process of conduction transfers heat;
Activity 46: Convection Currents  Challenge: How do differences in temperature cause a convection current?  Key Vocabulary:  Convection Current – the.
Convection Currents and the Mantle. The Heat of the Earth Earth’s outer core is nearly as hot as the surface of the sun.
 The measure of the average kinetic energy of particles. Temperature doesn’t depend on the number of particles.
Convection Currents and the Mantle
CONVECTION CURRENTS: GO with the FLOW
Guided Notes on the Causes of Plate Motions
Convection How can heat energy circulate through liquids and gases?
Heat and Heat Transfer.
CONVECTION CURRENTS.
Air Pressure Can you feel it?.
Heat Transfer 8th Grade Weather.
Convection in the Mantle
How does a hot air balloon work?
Convection and the Mantle
How is heat transferred? What causes convection currents?
II)Convection in the Mantle
Convection Currents and the Mantle
Warm Up! Name 3 objects on the right that will float in water.
The Atmosphere’s Air Pressure Changes
CONVECTION CURRENTS.
9-4 Mechanisms of Plate Motion
9.5 – Mechanisms of Plate Motion
Properties of Air Grade 6 Science Unit on Flight
Air Pressure Can you feel it?.
Mechanisms of Plate Motion
Convection Investigation 5 Part 2.
The Transfer of Heat Ms. De Los Rios 7th Grade
AN EXPANDING SITUATION
Properties of Gases 2/1/02 Revised 3/20/08.
Weather, Climate, and Me Lesson 6
Chapter 3, Lesson 4, Conduction, Convection, and Radiation
Chapter 1 Section 2: Convection Currents and the Mantle
CONVECTION CURRENTS.
Convection Currents and the Mantle
Density and Air Pressure
Convection Current.
How is heat transferred? What causes convection currents?
CONVECTION CURRENTS.
Earth structure and materials
Notes 6: Transferring Thermal Energy
Review 3.2 How is density measured?
Chapter 3, Lesson 4, Conduction, Convection, and Radiation
Presentation transcript:

Convection The driving force

Before you can understand convection, you need to remember density! Density = Mass Volume What happens if the volume increases but the mass doesn’t change? If you go from 1/2 to 1/4 (the bottom number got bigger) the value of the fraction goes down. So, if the volume goes up without changing the mass, the density will go down. Less dense things float up in fluids!

How do you make the volume increase without adding something and changing the mass? REMEMBER - temperature actually measures the speed of molecules. If something is heated, its molecules will speed up. If you warm a balloon, the air molecules in it will speed up and push harder on the walls of the balloon causing the balloon to expand (volume increases).

Convection Lab - Do quality work! 1. Make a side view sketch of the set-up. 2. Use arrows ( , , ,  ) to show directions water is moving throughout the tank (four sets of arrows: middle, top, sides, and bottom.) 3. Make top view drawings (before & after) to show what happens to dots floating on the water. 4. Explain completely why water moves in each of the four directions. (Start at middle bottom.) 5. Could this movement occur in the Earth’s interior? Describe how. ( THINK! Are there warmer and cooler places deep underground? Can underground materials flow?) 6. (Next slide)

6. Draw a cross-section view of the Mid-Atlantic Ridge with the asthenosphere below it. Draw arrows showing convection in the asthenosphere that could explain how the plates are pulled apart. Label everything. You show after time goes by drawing.

Why the Water Goes UP: Heat causes the water molecules to speed up. The water expands. The volume increases, but the mass doesn’t change, so the density decreases. The less dense, warm water floats upward. (7 things to say about going up!)

Why the Water Goes to the side: Warm water rising from the bottom pushes the warm water at the top towards the sides

Why the Water Goes DOWN: Cold causes the water molecules to slow down. The water contracts. The volume decreases, but the mass doesn’t change, so the density increases. The more dense, cold water sinks down. (7 things to say about the water sinking down!)

Why the Water Goes to the center: Cold water sinking from the top pushes the cold water at the bottom towards the center

Reading & Writing: Pages in purple book: Or - Pages in tan book: Section Convection Structure of Sun The driving mechanism For each of these book sections, write a paragraph explaining the significance of convection to that topic.