Unit 6 Heat Thermodynamics and Heat Transfer Learning

  • Slides: 27
Download presentation
Unit 6: Heat Thermodynamics and Heat Transfer

Unit 6: Heat Thermodynamics and Heat Transfer

Learning Goal: I can define temperature and heat and can describe the transfer of

Learning Goal: I can define temperature and heat and can describe the transfer of heat. Based on what you learned last week, how well can you: Define heat? Define temperature? Describe how heat is transferred? 2 Temperature

Review - Temperature is proportional to the average translational kinetic energy of the atoms

Review - Temperature is proportional to the average translational kinetic energy of the atoms and molecules make up the substance. Temperature is not a measure of the total kinetic energy in a substance. Temperature is not a measure of total thermal energy.

Temperature Scales What can you tell me about temperature scales based on our activity?

Temperature Scales What can you tell me about temperature scales based on our activity? 4

Temperature Scales Temperature is a quantity that corresponds to degree of hotness on a

Temperature Scales Temperature is a quantity that corresponds to degree of hotness on a chosen scale. A thermometer takes advantage of the fact the most substances expand with temperature. A thermometer measures temperature by comparing the expansion or contraction of a liquid (red alcohol) in increments on a scale. 5 Temperature

Temperature Scales The Celsius temperature scale is the scale used most often in the

Temperature Scales The Celsius temperature scale is the scale used most often in the world today. The scale is named after Anders Celsius who first suggested that a scale with 100º between the freezing and boiling point of water would be a good idea. 6 Temperature

Temperature Scales The Fahrenheit temperature scale is the scale commonly used in the US.

Temperature Scales The Fahrenheit temperature scale is the scale commonly used in the US. On the Fahrenheit temperature scale, water freezes at 32º and boils at 212º. 7 Tempe rature

CHECK YOUR NEIGHBOR True or false: Cold is the absence of fast-moving molecules. False;

CHECK YOUR NEIGHBOR True or false: Cold is the absence of fast-moving molecules. False; cold refers to very slow-moving molecules, not their absence.

Absolute Temperatures Is there an absolute upper limit and lower limit temperature? What would

Absolute Temperatures Is there an absolute upper limit and lower limit temperature? What would an maximum temperature be measuring? Is there a point where the particles couldn’t move any faster? Theoretically, temperature has no upper limit.

Absolute Temperatures What would an minimum temperature be measuring? Is there a point where

Absolute Temperatures What would an minimum temperature be measuring? Is there a point where the particles couldn’t move any slower – that is they are stopped? Yes! The absolute lower limit for temperature is called Absolute Zero The particles have lost all their kinetic energy and can’t get any colder

The Kelvin temperature scale was developed to help explain the relationship temperature and kinetic

The Kelvin temperature scale was developed to help explain the relationship temperature and kinetic energy (movement) 0 Kelvin (K) is Absolute Zero 273 K is the melting point of water (0º C) 373 K is the boiling point of water (100º C)

Converting Between Scales Do you think it is possible to convert a temperature measured

Converting Between Scales Do you think it is possible to convert a temperature measured on one scale to a different scale? Yes! You just need to use an algebraic equation to convert from one scale to the other.

Converting Between Scales ºC = 5/9 (ºF - 32) ºC = K + 273

Converting Between Scales ºC = 5/9 (ºF - 32) ºC = K + 273

Reflection Mark your calendar! Today’s learning goal: I can define temperature and heat and

Reflection Mark your calendar! Today’s learning goal: I can define temperature and heat and can describe how temperature scales are used. Using the scale, how do you think you are doing with the concept?

15 Temperature Thermodynamics Heat is transferred between objects. Thermal energy moves from high temperature

15 Temperature Thermodynamics Heat is transferred between objects. Thermal energy moves from high temperature to low temperature.

16 Temperature Thermodynamics What does equilibrium mean? Thermal Equilibrium =

16 Temperature Thermodynamics What does equilibrium mean? Thermal Equilibrium =

17 Temperature Laws of Thermodynamics First Law: When heat flows into or out of

17 Temperature Laws of Thermodynamics First Law: When heat flows into or out of a system, the gain or loss of thermal energy equals the amount of heat transferred.

18 Temperature Laws of Thermodynamics First Law: Heat/energy is neither created or destroyed

18 Temperature Laws of Thermodynamics First Law: Heat/energy is neither created or destroyed

19 Temperature Laws of Thermodynamics Second Law: Heat never spontaneously flows from a lower-temperature

19 Temperature Laws of Thermodynamics Second Law: Heat never spontaneously flows from a lower-temperature substance to a higher-temperature substance.

20 Temperature Laws of Thermodynamics Second Law: Heat moves from hot to cold.

20 Temperature Laws of Thermodynamics Second Law: Heat moves from hot to cold.

21 Temperature Laws of Thermodynamics Third Law: No system can reach absolute zero.

21 Temperature Laws of Thermodynamics Third Law: No system can reach absolute zero.

22 Temperature Heat Transfer 3 types: Conduction Convections Radiation

22 Temperature Heat Transfer 3 types: Conduction Convections Radiation

1 Temperature Heat Transfer

1 Temperature Heat Transfer

24 Temperature Heat Transfer http: //www. youtube. com/watch? v=7 Y 3 mf. AGV n

24 Temperature Heat Transfer http: //www. youtube. com/watch? v=7 Y 3 mf. AGV n 1 c

Temperature Activity Energy Transfer by Convection! 25 Temperature

Temperature Activity Energy Transfer by Convection! 25 Temperature

Temperature Activity Endothermic Reaction- Energy (Heat) is absorbed in the reaction, “It feels cold

Temperature Activity Endothermic Reaction- Energy (Heat) is absorbed in the reaction, “It feels cold when you touch it!” Exothermic Reaction- Energy (Heat) is released in the reaction, “It feels hot when you touch it!” 26 Temperature

27 Temperature Reflection Mark your calendar! Today’s learning goal: I can define temperature and

27 Temperature Reflection Mark your calendar! Today’s learning goal: I can define temperature and heat and can describe the transfer of heat. Using the scale, how do you think you are doing with the concept?

Heat Temperature Heat Transfer Thermal Expansion Thermodynamics HeatHeat Temperature Heat Transfer Thermal Expansion Thermodynamics Heat
Heat Temperature Heat Transfer Thermal Expansion Thermodynamics HeatHeat Temperature Heat Transfer Thermal Expansion Thermodynamics Heat
Heat Temperature Heat Transfer Thermal Expansion Thermodynamics HeatHeat Temperature Heat Transfer Thermal Expansion Thermodynamics Heat
Heat Temperature Heat Transfer Thermal Expansion Thermodynamics HeatHeat Temperature Heat Transfer Thermal Expansion Thermodynamics Heat
THERMODYNAMICS THERMODYNAMICS HEAT WORK THERMODYNAMICS Two common waysTHERMODYNAMICS THERMODYNAMICS HEAT WORK THERMODYNAMICS Two common ways
HEAT TRANSFER CONDUCTION HEAT TRANSFER gjv Recap HeatHEAT TRANSFER CONDUCTION HEAT TRANSFER gjv Recap Heat
Heat Transfer Conduction Convection Radiation Heat Transfer HeatHeat Transfer Conduction Convection Radiation Heat Transfer Heat
Understanding Heat Transfer Heat Transfer Heat always movesUnderstanding Heat Transfer Heat Transfer Heat always moves
Heat Transfer Heat Transfer o o Heat travelsHeat Transfer Heat Transfer o o Heat travels
Heat Transfer Heat Transfer Heat always moves fromHeat Transfer Heat Transfer Heat always moves from
Heat Transfer Heat Transfer Heat always moves fromHeat Transfer Heat Transfer Heat always moves from
Thermodynamics Temperature Heat Work Heat Engines Thermodynamics nThermodynamics Temperature Heat Work Heat Engines Thermodynamics n
Physics Heat Transfer and Thermodynamics 1 Heat andPhysics Heat Transfer and Thermodynamics 1 Heat and
UNIT 4 HEAT TRANSFER HEAT TRANSFER Transformation ofUNIT 4 HEAT TRANSFER HEAT TRANSFER Transformation of
Thermodynamics and Equilibrium Thermodynamics Thermodynamics the study ofThermodynamics and Equilibrium Thermodynamics Thermodynamics the study of
Topic 2 Thermodynamics Thermodynamics and Energy Thermodynamics TheTopic 2 Thermodynamics Thermodynamics and Energy Thermodynamics The
Thermodynamics Energy Changes and Matter Thermodynamics Thermodynamics isThermodynamics Energy Changes and Matter Thermodynamics Thermodynamics is
Thermal Energy Thermodynamics Heat n Heat The transferThermal Energy Thermodynamics Heat n Heat The transfer
Thermodynamics Heat G Heat is the transfer ofThermodynamics Heat G Heat is the transfer of
THERMODYNAMICS Heat Heat Heat Thermal energy that flowsTHERMODYNAMICS Heat Heat Heat Thermal energy that flows
Chapter 17 THERMODYNAMICS What is Thermodynamics Thermodynamics isChapter 17 THERMODYNAMICS What is Thermodynamics Thermodynamics is
Thermodynamics Laws of thermodynamics Annapoorna M Introduction ThermodynamicsThermodynamics Laws of thermodynamics Annapoorna M Introduction Thermodynamics
Laws of Thermodynamics Thermodynamics Thermodynamics is the studyLaws of Thermodynamics Thermodynamics Thermodynamics is the study
THERMODYNAMICS 1 CHEMICAL ENGINEERING THERMODYNAMICS THEORY Thermodynamics bornTHERMODYNAMICS 1 CHEMICAL ENGINEERING THERMODYNAMICS THEORY Thermodynamics born