Engage: Unit 4: Heat. Heat. Bell Ringer: 1- What do you think temperature is? 2- How is it measured? Bell Ringer: 1- What do you think temperature is? 2- How is it measured?
Unit 4: Heat. The terms hot and cold are not very scientific terms. If you really want to know how hot or cold something is, you must use temperature
Unit 4: Heat. Temperature. Temperature: is a measure of the average kinetic energy of the particles in an object
Unit 4: Heat. Temperature. Which block has the greater temperature? Why?
Unit 4: Heat. Temperature. Thermometer: tool used to measure temperature. Thermometers can measure temperature because of thermal expansion. Thermal expansion is the increase in volume of a substance due to an increase in temperature.
Unit 4: Heat. Temperature. Have you ever gone across a highway bridge with a car? Some bridges are constructed with small gaps called expansion joints… To keep the bridge from buckling (expanding) on a hot day!
Unit 4: Heat. Temperature. Thermal expansion also occurs in a thermostat. A bimetallic strip in the thermostat is made of two different metals, causing them to expand at different rates. Thus the strip coils or uncoils. Thermal expansion also occurs in a thermostat. A bimetallic strip in the thermostat is made of two different metals, causing them to expand at different rates. Thus the strip coils or uncoils.
Unit 4: Heat. Temperature. Three temperature scales: Fahrenheit ( o F) used in our daily lives Celsius ( o C) used in science The official SI temperature scale Kelvin (K) Three temperature scales: Fahrenheit ( o F) used in our daily lives Celsius ( o C) used in science The official SI temperature scale Kelvin (K) Be sure to write the boiling and freezing points of water in your notes!!!
Unit 4: Heat. Temperature. The lowest temperature on the Kelvin scale is 0 K, which is called absolute zero. It is not possible to reach a temperature lower than absolute zero! (Fun fact: absolute zero has never been reached) It is not possible to reach a temperature lower than absolute zero! (Fun fact: absolute zero has never been reached)
Unit 4: Heat. Temperature. Which of the following temperatures is lowest? a)100 o C b)100 o F c)100 K Which of the following temperatures is lowest? a)100 o C b)100 o F c)100 K
Unit 4: Heat. Temperature. Now lets play this game and fill out the sheet that goes with it!
Why is it that when you go to the doctor the tongue depressor does not feel as cold as the stethoscope? Unit 4: Heat. Heat. The answer has to do with how energy is transferred between the material and your skin! Mr. Edmond Heat vs Temp watch?v=ZYuhMXmJeh4
Heat: is the transfer of energy between objects that are at different temperatures. Unit 4: Heat. Heat. When two objects at different temperatures come in contact, energy is ALWAYS transferred from the higher temperature to the lower temperature!
Thermal energy: is the total energy of the particles that make up a substance. Units of thermal energy are measured in Joules (J) Thermal energy: is the total energy of the particles that make up a substance. Units of thermal energy are measured in Joules (J) Unit 4: Heat. Thermal Energy. An object at a high temperature has more thermal energy
Unit 4: Heat. Thermal Energy. Thermal energy also depends on how much of the substance you have. Although both have the same temperature, the pot of soup has more thermal energy because it is LARGER!
Unit 4: Heat. Thermal Energy. Which has more thermal energy?
Unit 4: Heat. Thermal Equilibrium. When two objects reach thermal equilibrium… 1)They are not the same temperature 2)Thermal energy is no longer transferred between the two objects 3)One object may have more thermal energy When two objects reach thermal equilibrium… 1)They are not the same temperature 2)Thermal energy is no longer transferred between the two objects 3)One object may have more thermal energy
Convection convection radiation OGRY