Understanding Heat and how Heat gets Transferred Conduction

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Understanding Heat and how Heat gets Transferred Conduction, Convection and Radiation

Understanding Heat and how Heat gets Transferred Conduction, Convection and Radiation

Heat & Heat Transfer • Heat: Heat is energy! Heat is the energy transferred

Heat & Heat Transfer • Heat: Heat is energy! Heat is the energy transferred (passed) from a hotter object to a cooler object. • Heat Transfer: The transfer (passing) of heat from one object to another. Heat always moves in the direction from: higher temperatures to lower temperatures. warm to cool • Always! Always from high energy to low! • Hot objects in a cooler room will cool to room temperature. • Cold objects in a warmer room will heat up to room temperature.

Question #1 • If a cup of coffee and a red popsicle were left

Question #1 • If a cup of coffee and a red popsicle were left on the table in this room what would happen to them? Why? • The cup of coffee will cool until it reaches room temperature. The popsicle will melt and then the liquid will warm to room temperature.

Question #2 • As the cup of coffee cools, how is the heat moving?

Question #2 • As the cup of coffee cools, how is the heat moving? Why? • The heat in the cup of coffee is moving from the cup of coffee into the air. This is because heat always moves in the direction from higher temperatures to a lower temperatures.

Question #3 • As the red popsicle melts, how is the heat moving? Why?

Question #3 • As the red popsicle melts, how is the heat moving? Why? • The heat in the air is moving from the air into the popsicle. This is because heat always moves in the direction from higher temperatures to a lower temperatures.

Heat Transfer Methods • Heat transfers in three ways: 1. Conduction 2. Convection 3.

Heat Transfer Methods • Heat transfers in three ways: 1. Conduction 2. Convection 3. Radiation

Conduction • Conduction: Conduction happens when 2 objects at different temperatures touch each other.

Conduction • Conduction: Conduction happens when 2 objects at different temperatures touch each other. Heat flows from the warmer to the cooler object. • Examples?

Conduction Close up of what happens when you heat a metal strip at one

Conduction Close up of what happens when you heat a metal strip at one end, how the heat travels to the other end. As you heat the metal, the particles vibrate, these vibrations make the adjacent particles vibrate, and so on, the vibrations are passed along the metal and so is the heat. We call this? Conduction

Convection • Convection: In liquids and gases, convection happens when the part of the

Convection • Convection: In liquids and gases, convection happens when the part of the liquid or gas that is warmer rises. As this happens, cooler liquid or gas sinks taking the place of the warm part. • Examples?

This is a close up of what happens to the particles in a liquid

This is a close up of what happens to the particles in a liquid or a gas when you heat them HEAT Rises The particles spread out and become less dense.

Convection: Example: Water Movement Cools at the surface Cooler water sinks Convection current Hot

Convection: Example: Water Movement Cools at the surface Cooler water sinks Convection current Hot water rises

Convection: Example: Air Movement

Convection: Example: Air Movement

What is the third method of heat transfer? Hint: How does heat energy get

What is the third method of heat transfer? Hint: How does heat energy get from the Sun to the Earth? There are no particles between the Sun and the Earth so it CANNOT travel by conduction or by convection. RADIATION: The ? direct transfer of energy by electromagnetic waves (Infared Radiation). Examples: Heat from solar energy and a campfire.

Radiation Quiz Radiation travels in waves True/False Radiation can travel through a vacuum True/False

Radiation Quiz Radiation travels in waves True/False Radiation can travel through a vacuum True/False Radiation requires particles (molecules) to travel True/False Radiation travels at the speed of light True/False

1. Which of the following is not a method of heat transfer? A. Radiation

1. Which of the following is not a method of heat transfer? A. Radiation B. Temperature C. Conduction D. Convection

2. How does heat energy reach the Earth from the Sun? A. Radiation B.

2. How does heat energy reach the Earth from the Sun? A. Radiation B. Conduction C. Convection

Name that Form of Heat Transfer A A. Conduction B B. Convection C C.

Name that Form of Heat Transfer A A. Conduction B B. Convection C C. Radiation

Understanding Heat and how Heat gets Transferred ConductionUnderstanding Heat and how Heat gets Transferred Conduction
HEAT TRANSFER Conduction Heat is transferred from heatHEAT TRANSFER Conduction Heat is transferred from heat
Heat Conduction in Solids Overview of Heat ConductionHeat Conduction in Solids Overview of Heat Conduction
Heat conduction Fouriers law of heat conduction SteadyHeat conduction Fouriers law of heat conduction Steady
Chapter 2 Introduction to Conduction Heat Conduction HeatChapter 2 Introduction to Conduction Heat Conduction Heat
Chapter 2 Introduction to Conduction Heat Conduction HeatChapter 2 Introduction to Conduction Heat Conduction Heat
HEAT CONDUCTION Conduction the transfer of heat byHEAT CONDUCTION Conduction the transfer of heat by
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Heat What is heat Heat is energy transferredHeat What is heat Heat is energy transferred
Conduction Transfer Mechanisms Heat can be transferred inConduction Transfer Mechanisms Heat can be transferred in
Heat can be transferred by Conduction Convection AdvectionHeat can be transferred by Conduction Convection Advection
Heat and Heat Transfer Heat Temperature Conduction ConvectionHeat and Heat Transfer Heat Temperature Conduction Convection
Heat Transfer Conduction Convection and Radiation Heat HeatHeat Transfer Conduction Convection and Radiation Heat Heat
Heat Transfer Introduction and Conduction Conduction If aHeat Transfer Introduction and Conduction Conduction If a
Transferred Epithet D efinition Transferred epithet is aTransferred Epithet D efinition Transferred epithet is a
HEAT TRANSFER CONDUCTION HEAT TRANSFER gjv Recap HeatHEAT TRANSFER CONDUCTION HEAT TRANSFER gjv Recap Heat