1 Chapter 2; Section 2 Atmospheric Heating Heat transfer
2 THINK ABOUT IT…If you add ice to lemonade on a hot summer’s day why does the ice melt? Choose the best answer:A. The coldness from the ice moved into the lemonadeB. The heat from the lemonade moved into the iceC. The coldness and heat moved back and forth until the lemonade cooled off
3 The correct answer is B. The heat from the lemonade moved into the ice. Heat energy is transferred from one place to another through the process of heat flow.This thermal energy will only move from a warmer object to a cooler object, never the other way around.Heat went into the ice from the lemonade, cooling the lemonade and melting the ice
5 Radiation: Solar Energy Transfers by Waves Radiation: is energy that is transferred as electromagnetic waves, such as visible light and infrared waves.Examples include visible light, radio waves, and radiant heat.Can be in the form of particles or waves.
7 Conduction Solar Energy Transfers by Contact The direct transfer of heat from one substance to another substance that is touching it.Molecules can pass heat energy to adjacent molecules, heating them as wellConduction works better in certain substances, like metals
9 The transfer of heat by a liquid or gas (such as air). ConvectionThe transfer of heat by a liquid or gas (such as air).Can only occur in liquids and gases (relatively big spaces between the molecules)A convection current is where hot air rises and cold air sinks.
12 Green house effectGreen house effect- Is a natural process that permits the Earth to retain some of the heat from the sun.This process functions like the glass of a greenhouse,allows solar energy to enter but prevents it from escaping.Without the greenhouse effect the earth would be cold as Mars!But too much Greenhouse gases can heat up the Earth too fast: Rising seas, Polar ice melting, Unpredictable storms
13 Green house gasesGases in the atmosphere (water vapor, carbon dioxide, nitrous oxide, and methane) trap energy from the sun.
15 Global warming The gradual increase in average global temperatures Data shows that the average global temperatures have increased in the past 100 years.Scientists hypothesize that greenhouse gases may be the cause.
16 Heating in the troposphere Convection causes most of the heating of the troposphereAir near the ground is heated by the sun (radiation)The molecules gain energy and move fasterAs they bump into each other they move further apart and become less denseThe less dense air then rises due to the warm temperatureCooler, denser air sinksThis causes a constant movement of heat through the troposphere called convection current!!
17 RadiationDirect transfer of energy without heating the space in betweenFireplaceMicrowaveRadiatorEnergy from the Sun to the Earth
18 Convection Transfer of a heat through a fluid (gas or liquid) Oven Boiling WaterAir rising (hot)andfalling (cold
19 ConductionTransfer of heat from one substance to another that is touchingHair StraightenerHeating PadElectric BlanketEnergy from molecules that touch Earth’s surface