Heat Energy

What is Heat Energy?

Heat Energy Heat Energy is the sum total of all of the energy of the particles of an object. Heat energytemperature Heat energy and temperature are related though DIFFERENT. Temperature Temperature is the average kinetic energy of the particles of an object. A bathtub full of water at 100 o F has more thermal energy than a thimble of water at 100 o F. The temperature is the same but the total amount of energy is different. The bathtub has more energy.

Heat Transfer is the movement of heat from one place to another How is Thermal Energy Transferred? Conduction Conduction – direct contact Convection Convection – through a fluid Radiation Radiation – by electromagnetic waves

Radiation

What is heat transfer by radiation? Radiation is heat transfer by electromagnetic waves. These wave may pass through all states of matter and also through NO matter – such as the vacuum of space. This energy is often called radiant energy. Radiant energy from the sun travels through the vacuum of space, until it reaches the earth.

Radiation is the movement of energy as electromagnetic waves. There are different types of radiation: – Radio waves – Microwaves – Infrared rays – Visible light – Ultraviolet light – X-Rays – Gamma Rays – Cosmic Rays We call this the electromagnetic spectrum

Conduction

conduction What is heat transfer by conduction? Heat transfers as particles of an object increase their collisions as heated. These collisions transfer the heat energy through the object by colliding with adjacent particles.

Conduction When your hands touches a metal spoon sitting in a boiling pot of soup, the heat from the bottom of the pot is transferred to you hand by conduction. Feet on a cold concrete floor is CONDUCTION!

Convection

convection What is heat transfer by convection? Heat is transferred through a substance through currents. This occurs in fluids (liquids AND gases) Convection Convection currents are caused by heating of a liquid or gas, the liquid or gas rises, then cools and falls. This occurs in the mantle of the earth And in the atmosphere. Most of our weather patterns are the result of convection currents in the atmosphere.

Convection The heating and cooling of the fluid, changes in the fluid’s density, and the force of gravity combine to set convection currents in motion. Without heat, convection currents will eventually come to a stop.

Radiation, Conduction, and Convection

What kinds of energy transfer is this?

Stopping Heat Transfer