Convection Currents and the Mantle EQ How is

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 heat amounts of energy to change temperature. ice 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 EQ: How is heat transferred? • Read pages F 25 – F 27, questions 1 -5