CONDUCTION HOW DOES HEAT MOVE 3 ways Conduction

CONDUCTION

HOW DOES HEAT MOVE? 3 ways: - Conduction - Convection - Radiation

CONDUCTION “The transfer of heat energy between substances that are in contact with each other” Back to the Particle Model of Matter: Particles of matter are constantly moving and bumping into each other. When particles with more energy (warm particles) bump into particles with less energy (cool particles), they transfer some of their energy to the slower particles. Kinetic energy from hot particles cold particles

ARE YOU MORE LIKELY TO COLLIDE WITH PEOPLE IN A CROWDED OR NEAR EMPTY ROOM? Solids, where particles are closer together, are more likely to transfer heat by conduction.

THERMAL EXPANSION AND CONTRACTION More heat = Faster particles = More space between particles = Bigger object

EXAMPLES Expansion Joints Balloons Thermometers

SO, DURING CONDUCTION… - Heat transfers from high energy low energy - The warm object gets smaller as heat is removed from it - The cool object gets bigger as heat is added to it

CONDUCTORS AND INSULATORS CONDUCTORS: INSULATORS: - Easily allows for heat to move through - Does not allow heat to move through very well - Metals - Plastic, Cork, Wood Which would you want to use in a thermos?

VIDEOS https: //www. youtube. com/watch? v=tpkyuqial 8 o#t=282. 417465 https: //www. youtube. com/watch? v=h 4 j. Bak__Xzk