Heat

What is heat?

• energy is transferred between the system and

  the environment via atomic-level collisions

• form of energy that is transferred between objects with different temperatures.

• Microscopic energy of moving molecules and stretched molecular bonds.

What is Thermal Interactions?

• form of energy that is transferred between objects with different temperatures.

• Microscopic energy of moving molecules and stretched molecular bonds.

• energy is transferred between the system and

  the environment via atomic-level collisions

500 calories to joules:

• 2092 J

• 2082

• 2093

2.5 megajoules to calories:

• 539,971.75 cal

• 621,364.25 cal

• 598,474.75 cal

Q>0 when the environment is at a higher temperature than the system.

• Energy is transferred in.

• is at the same temperature as the environment.

• Energy is transferred out.

Sign of Heat

• Q

• ∆Q

• E

SI unit of Heat

• cal

• J

• Cal

Q<0 when the system is at a higher temperature than the environment.

• Energy is transferred in.

• it is at the same temperature as the environment

• Energy is transferred out.

Heat Lamps (a)___

• radiation

• conduction

• convection

Feet on Hot Sand (a)__

• conduction

• radiation

• convection