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Chapter 9: Weather Chapter 9: Weather FactorsFactors
Section 2: Heat Transfer
Thermal Energy and Thermal Energy and TemperatureTemperatureTemperature - the average
amount of energy of motion of each particle of a substance.◦Measures how hot or cold
Thermal Energy – the total energy of motion in the particle of a substance.
Measuring TemperatureMeasuring TemperatureAir temperature is usually
measured with a thermometer.
Measuring Temperature Measuring Temperature ContinuedContinuedTemperature ScalesTemperature is measured in units
called degreesCelsius Scale
•Pure Water
•Freezing: 0ºC
•Boiling: 100ºC
Fahrenheit Scale
•Pure Water
•Freezing: 32ºF
•Boiling: 212ºF
Converting UnitsConverting UnitsFrom Fahrenheit to CelsiusºC = 5/9(ºF – 32)Suppose it is 68ºF
ºC = 5/9(ºF – 32)ºC = 5/9(68 – 32)ºC = 5/9(36)ºC = 20
How Heat is TransferredHow Heat is TransferredHeat is the transfer of thermal
energy from a hotter object to a cooler one.
Heat is transferred in three ways◦Radiation◦Conduction◦Convection
Radiation, conduction, and convection work together to heat the troposphere.