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Chapter 7 Heating and Cooling

Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

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Page 1: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

Chapter 7Heating and Cooling

Page 2: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

How living things adapt …Animal Adaptation

Humans keep warm bySome birds keep warm bySnakes and lizards keep warm byDogs cool off byHoney bees cool their hives byPeople cool off by

Page 3: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

HVAC• Heating• Ventilation• Air conditioning • Cooling

Excellent jobs; apprenticeship opportunitieshttp://www.ontariocolleges.ca/SearchResults/PROFESSIONS-TRADES-HRAC-HEATING-REFRIGERATION-AIR-CONDITIONING/_/N-lpqj

Page 4: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

If we are serious about reducing the energy consumption of our homes to save money and reduce our use of valuable resources –what can we do to cool our homes in summer and warm them in winter?

• Wood fireplaces• Draft blockers at base of doors and windows• Blinds on windows• Shade trees around house• Create breeze corridors

Page 5: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

The Particle Theory of Matter (again!)

All matter is made up of tiny particles.Particles have spaces between them.Particles are moving all the time.Particles move when they are heated.Particles attract each other.

Page 6: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

Heat, Temperature and Thermal Energy

Heat is the transfer of energy from warmer things to cooler things.

How does this happen? (best answer please)

A. particles have self-regulated thermometers B. collisions between particlesC. thermal energy jumps form particle to particleD. only special particles carry heat

Page 7: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

Since particle are always moving we say that they have ….

A. thermal energyB. potential energyC. electric energyD. kinetic energy

Temperature is defined as the measure of average _______ of particles.E. thermal energyF. potential energyG. electric energyH. kinetic energy

Page 8: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

The higher the temperature …A. the less the average kinetic energy of the particles.B. the greater the average kinetic energy of the particles.

Thermal energy is defined as the total kinetic energy of the particles and the energy of attraction between them.

Recal that I gave you a bag full of corks representing thermal energy. You then had to share them among the “particles” in your group. The average corks per person represented temperature and the total number of corks represented thermal energy.

Page 9: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

Use the particle theory to explain thermal expansion and contraction.

Volume increases

If volume cannot increase pressure increases Density decreases: particles per unit volume

Moving particles have more collisionsMore collisions cause forces of attraction to

weaken Particles move farther apart from each other

Add thermal energyThermal energy is converted to kinetic energy of particles Particles move more

Page 10: Chapter 7 Heating and Cooling. How living things adapt … AnimalAdaptation Humans keep warm by Some birds keep warm by Snakes and lizards keep warm by

Use the particle theory to explain thermal expansion and contraction.

Volume decreases

Contraction/ less pressure Density increases: particles per unit volume

Moving particles have fewer collisionsFewer collisions cause forces of attraction to

strengthen Particles move closer together.

Remove thermal energyKinetic energy is converted to

thermal energy of particles Particles move less