Click to edit Master subtitle style Chapter 2 Energy: Warming the Earth and the Atmosphere
I. Energy, Temperature, and Heat n Energy from the sun drives weather n Energy is the ability or capacity to do work on some form of matter n Potential Energy n Kinetic Energy n Internal Energy n First law of thermodynamics
What is Temperature? n Temperature: a measure of the average speed of the atoms and molecules of an object Click here to activate this figure
What is Heat? n Heat: the transfer of energy due to temperature differences n Specific Heat: heat capacity of a substance per unit mass
Latent Heat – The Hidden Warmth n Latent Heat: heat energy required to change a substance from one state to another n Water can exist as a vapor, water, or ice n Sensible heat is felt, whereas latent heat is not, rather stored or “hidden”
Latent Heat – The Hidden Warmth n Evaporative Cooling n Consider a water droplet with some molecules evaporating… n Condensational Heating n Consider a water droplet forming…
Latent Heat has a role in the Atmosphere? n Provides energy for storms n Distributes heat from the tropics to the poles
The latent heat released in this cloud formation is equivalent to a small atomic bomb!
II. Heat Transfer in the Atmosphere n Heat is transferred from warmer to colder objects n How does temperature difference relate to heat transfer? n 3 Mechanisms n Conduction n Convection n Radiation
Heat Transfer - Conduction n Conduction: transfer of heat by molecular contact n What does it mean to be a good conductor?