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.