HEAT TRANSFER Chapter 22 RECAP Heat is ALWAYS

HEAT TRANSFER Chapter 22

RECAP Heat is ALWAYS transferred from Objects of one another temperatures that are brought near until all have a

CONDUCTION Can take place that are in Materials that conduct heat well are known as � Collisions �When between , atoms start to until all atoms are �Free electrons that can drift are made to and one part is Materials with

WOOD VERSUS METAL Touch the faucet and touch the wooden drawer Which is cooler? Is it really? What temperature are both of them at? What is really happening?

Wood is heat conductors are called Objects that No can TOTALLY It at which heat Liquids and gases tend to be Porous materials are is & Cold is NOT energy; Heat

CONVECTION Movement of i. e. a pot of water of the stove demonstration on p 327 Occurs in When fluid is , it , becomes less ~ Archimedes’ Principle Warmer fluid is by Cooler fluid moves to the Keeps fluid

Convection currents are produced by Some areas of the earth more readily than others Land is than water in the day air from above water takes the place of warmer air, Land is than the water at night

WHY RISING WARM AIR COOLS Rising Less atmospheric air heats up Molecules in a region with than with approaching ones Rebound speed

RADIATION Radiant energy Any energy that is In the form of Radio waves, microwaves, infrared, visible light, UV, X rays, gamma rays ( Measured in

All objects continually emit a mixture of obj = If obj is hot enough, Lamp If filament, sun, fireplace all radiant energy falls on other objects, part of energy is Absorbed part increases in