Heat Notes
- piercy932
- Dec 4, 2014
- 1 min read
Heat
Heat is the flow of thermal energy, which always flows from hot to cold.
Temperature is a measure of the average kinetic energy of molecules.
As a substance heats up (absorbs thermal energy) its molecules move faster and
get farther apart.
Kinetic energy increases, as molecules speed increase
Conduction- heat that is transferred by contact and collision of molecules which can
happen in solids, liquids, and gases.Metals are good conductors they can transfer
energy with contact easier than other materials.
Convection‐“heat rises”, only occurs in liquids and gases,
Radiation ‐heat that is transferred by electromagnetic radiation (infrared rays).
Q = mc∆T ---> the amount of heat that is transferred= mass * specific heat * change in temperature
Phase changes is when energy is absorbed or released (melting/freezing or boiling/condensing) The temperature does not change.
Evaporation is a cooling process (seen in the water cycle too)
Condensation is a warming process
Comments