2 Molecules and MotionThe motion of atoms or molecules is called thermal energy.The more motion, the more energy.
3 HeatThe movement of thermal energy from a warmer object to a colder one.
4 Forms of heat transferThree forms of heat transfer:ConductionConvectionRadiation
5 ConductionConduction involves the transfer of heat through direct contact.Conductors allow heat to transfer, insulators do not.
6 ConvectionTakes place in liquids and gases as molecules move in currentsWarm fluids rise and cold ones sink.
7 Radiation Heat is transferred through empty space. Energy from the sun being transferred to the Earth.
8 QuestionsWhat are the three types of heat transfer?How is conduction different from radiation?
9 What type of heat transfer is involved? Heating a room with a fireplaceEgg cooking in a frying panRoof of a house becoming hot
10 What type of heat transfer? Warm air mass bringing a change in the weather.Wire getting hot from an electric appliance.
11 Temperature and HeatKinetic energy is the energy of motionTemperature is the measure of the kinetic energy of particles in a substance.
12 Thermometer A instrument used to measure temperature Thermometers commonly have alcohol (with dye) or mercuryDigital thermometers have replaced older ones
13 Celsius ScaleCelsius is the metric scale for measuring temperatureWater freezes at 0ºC and boils at 100ºC
14 Kelvin scaleThe Kelvin scale is a metric temperature scale measured in Kelvins (K)Formula (273+ºC)= Kelvin
15 QuestionsWhat is the formula for converting a Celsius temperature to a Kelvin temperature?What is the boiling point of water on the Kelvin scale?What is the freezing point of water on the Kelvin scale?
16 Absolute zeroThe temperature in which all molecular motion stops (0 K)
17 QuestionsDescribe absolute zero.What is absolute zero on the Celsius scale?
18 Temperature Joule is the unit for measuring thermal energy. Energy, mass, and type of substance determine the amount of temperature change
19 Specific Heat The ability of a substance to absorb thermal energy. Different substances absorb heat at different rates.The greater the mass of the object the more heat can be absorbed.
20 Calculating Heat Energy EnergyHeat =Mass x Temp Change x Specific HeatMass in KgTemp change in Kelvins (K)Specific Heat in Joule/Kg - K
21 QuestionsHow can heat be measured?What is the unit used to measure heat?What is specific heat?
22 Heat expansionAs atoms move faster, they take up more space.Most solids, liquids, and gases expand as they are heated
23 Unusual Expansion of Water Between 4ºC and 0ºC, water EXPANDS as it cools and turns into a solid.