Thursday, September 4, 2008
UNIT 9:- Thermal properties of matter
+ particles in a solid vibrate about fixed positions are held together by strong interatomic or intermolecular bonds.
+ total energy of these particles is called : INTERNAL ENERGY
internal energy comprises two components
----- kinetic energy-----
----- potential energy -----
** kinetic component
- due to vibration of the particles
- related to temperature
- higher temperature = more vigorous the vibrations
~ kinetic enegy is due to their movement instead of vibration
** potential component
- due to the stretching and compressing of intermolecular bonds as the particles vibrate
amount of potential energy stored in the bonds depends on the force between the particles and how far apart the particles are.
!! if the temperature of a substance rises, it is due to an increase in the average kinetic energy of its particles only.
potential energy is stores in the slinky as it is stretched or compressed, much like the interatomic or intermolecular bonds of particles.
a microwave oven raises the internal energy of food by making water molecules in the food vibrate vigorously.
WE JUSTLOVE PHYSICS!!
7:17 AM
