Presentation on theme: "Convection Currents and the Mantle EQ: How is heat transferred?"— Presentation transcript:
Convection Currents and the Mantle EQ: How is heat transferred?
Heat transfer - the movement of energy from a warmer object to a cooler object. Energy is transferred from the warmer lemonade to the cold ice through heat. Different materials require different amounts of energy to change temperature. ice heat EQ: How is heat transferred?
Heat Transfer There are three types of heat transfer –Radiation –Conduction –Convection EQ: How is heat transferred?
Radiation Transfer of energy through empty space No direct contact between a heat source and an object EQ: How is heat transferred?
Conduction Heat transfer by direct contact of particles of matter Heating a spoon in a pot of soup –Particles near the bottom of the spoon heat faster as they are heated, so they bump into other particles and heat them too. –Gradually the entire spoon heats up –When you touch the spoon, conduction transfers heat to your hand EQ: How is heat transferred?
Convection Heat transfer involving the movement of liquids and gasses Caused by difference in temperature and density within a fluid –Density – a measure of how much mass is in a substance EQ: How is heat transferred?
Convection – What happens? Liquid or gas is heated and the particles move faster As they move faster, particles spread apart and take up more space and density decreases EQ: How is heat transferred?
Convection As the fluid cools, particles move slower and settle closer together, increasing density, and sinking EQ: How is heat transferred?
Convection Currents Flow that transfers heat within a fluid Heating and cooling of the fluid, changes in the fluid’s density, and the force of gravity combine to set convection currents in motion EQ: How is heat transferred?
Class Work and Homework Fill In What did I learn Confused Say Read pages F25 – F27, questions 1-5 EQ: How is heat transferred?