Energy Flows From Warmer To Cooler Objects

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Presentation transcript:

Energy Flows From Warmer To Cooler Objects EQ: How is heat different than temperature?

Heat and Temperature Heat – the flow of energy from an object at a higher temperature to an object at a lower temperature Heat always flows from the warmer object to the cooler object EQ: How is heat different than temperature?

Heat and Temperature Temperature – a measurement of the average kinetic energy of particles in an object EQ: How is heat different than temperature?

Thermal Energy The total random kinetic energy of particles in an object Different from temperature in that temp is an average and thermal energy is a total EQ: How is heat different than temperature? hot liquid cold liquid

Thermal Energy Put ice in lemonade Energy from warmer lemonade transfers to colder ice cube Lemonade’s thermal energy decreases and the ice’s thermal energy increases Particles in lemonade have transferred some of their energy to the ice particles EQ: How is heat different than temperature?

Thermal Energy EQ: How is heat different than temperature? ice heat Particles in lemonade have transferred some of their energy to the ice particles Therefore the average kinetic energy of the lemonade decreases and the temperature of the lemonade decreases

Measuring Heat EQ: How is heat different than temperature? Calorie – the amount of energy needed to raise the temperature of one gram of water by 1° C Joule (J) – the international standard of measurement for measuring energy. 1 calorie = 4.18 joules

Specific Heat The amount of energy required to raise the temperature of 1 gram of a substance by 1°C Every substance has its own heat value Each substance absorbs a different amount of energy in order to show the same increase in temperature EQ: How is heat different than temperature?

Class Work and Home Work Fill In What did I Learn Confused Say EQ: How is heat different than temperature? Read selection 2-2 Energy Flows from warmer to cooler objects Questions 1-6, p. B 48, “How Hot Is Hot” 1-3, plus the challenge question