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# Heat Definition

Heat is the transfer of thermal energy from one object or region to another. For example, sunlight increases the temperature of a surface.

Grades 6-8 VideoHeat: Transfer of Thermal Energy
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## Heat: Transfer of Thermal Energy

### Fun Facts

• A hot cup of coffee transfers heat to the surrounding air over time.
• A thinner copper rod melts chocolate faster than a thicker one when heated.
• Heated fluid rises, but liquids are not very good conductors of heat.

### Why Do We Need To Know About Heat

Learning about how heat moves helps us know why certain things, like jackets or emergency blankets, are made the way they are. This keeps us warm, safe, and saves energy. For example, how a jacket keeps you warm or how a shiny emergency blanket stops heat from escaping shows how important it is to control heat in making products.

Also, things like solar cookers, which use the sun to cook food, and how computers stay cool show us the role of heat in using clean energy and in gadgets. Knowing about heat transfer opens up job chances in areas like heating and cooling systems, making appliances, and ensuring fire safety. This shows how knowing about heat is useful in many different jobs.

What is the difference between heat and thermal energy?
Thermal energy is the energy contained within a system due to the motion of the particles. Heat is the transfer of thermal energy from a warmer system/object to a cooler system/object.
When the temperature of an object decreases, what has happened?
The particles (atoms/molecules) that make up that object are moving slower. Heat has been transferred from the object to its surroundings or to another object.
What factors determine the thermal properties of a material?
The amount of material (mass) and its composition (what it’s made of).
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