Heat Energy
Radiant heat energy
moves from an area of higher temperature to an area of cooler temperature
Convection particles
particles with higher energy move from one location to another carrying their energy with them.
Convection
the transfer of energy as heat by movement of the heated substance itself, as currents in fluids (liquids and gases)
Radiation
the transfer of energy through space without particles of matter colliding or moving to transfer the energy
Conduction transfer as heat
The transfer of energy as heat occurs between particles as they collide within a subtance or between two objects in contact
Convection heating
uneven heating can result in convection, both in the air and in water. This causes currents in the atmosphere (wind) and in bodies of water on earth which are important factors in weather and climate
Radiation energy
warms an object when it is absorbed
Conduction in materials
All materials do not conduct heat energy equally well.
How does Heat transfer?
Heat can transfer in three ways: conduction, convection, and radiation.
Conduction Example
If a plastic spoon and a metal spoon are placed in a hot liquid, the handle of the metal spoon will get hot quicker than the handle of the plastic spoon because heat is conducted better through metal than plastic
Poor conductors
Poor conductors of heat are called insulators
Conduction transfer
The energy transfers from an area of higher temperature to an area of lower temperature
How does heat transfer by radiation?
The heat transfers through space without the objects touching or the particles colliding. (Fire)
How can we use heat energy and transfer?
We keep warm by using insulators to keep heat in. We warm ourselves by a fire.
How does heat transfer by convection?
When particles in the liquid or gas move they take their heat with them from the warmer part to the cooler part. (Warm water currents in a lake.)
How does heat transfer by conduction?
When the objects come into contact with each other the heat is transferred. (Heating Pad)
Convection heat transfer
heat transfer occurs when particles with higher energy move from warmer to cooler parts of the fluid
Conduction
involves objects in direct contact