Questions and Answers
What is the direction of heat flow?
What is the term for heat flow in solids?
What is the result when two objects reach the same temperature?
What is the medium required for heat flow in solids?
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How does heat flow in a vacuum?
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Why do the clothes from the dryer feel warm?
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What is heat energy?
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What occurs when the hot part of a fluid expands and becomes less dense?
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What is the direction of heat flow in fluids?
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What happens to the molecules in hot clothes when they come into contact with cold skin?
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What is the primary difference between heat flow in solids and heat flow in fluids?
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What is an example of a convection current?
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Why does steam rise when it escapes from the dishwasher?
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What is the main mechanism of heat transfer in fluids?
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What happens to the molecules in a fluid when it is heated?
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Study Notes
What is Heat Flow?
- Heat is a type of energy measured in joules, and is energy in the form of random molecular motions.
- Heat energy can flow from one place to another and cannot be created or destroyed.
Characteristics of Heat Flow
- Heat always flows from a hot place to a cold place when flowing spontaneously.
- Heat flow can be forced to flow in the opposite direction using energy, such as in a refrigerator.
- Heat will continue to flow until the two objects reach the same temperature, which is called thermal equilibrium.
Heat Flow in Different Mediums
- Heat can flow in solids, liquids, gases, and even in a vacuum.
- Heat flow in a vacuum is called radiation, and is the transfer of energy through electromagnetic waves.
Heat Flow in Solids
- Heat flow in solids can only happen when those solids are in contact with one another.
- The process of heat flow in solids is called conduction.
- Conduction occurs when two objects in contact with one another transfer heat between them due to a temperature difference.
- Energy is transferred between molecules, but the molecules themselves do not move.
Heat Flow in Fluids
- Heat flow in fluids is a process called convection.
- Convection occurs when the hot part of a fluid expands and becomes less dense, causing it to rise above the cooler part.
- This creates a cycle that transfers energy, known as a convection current.
- Heat rising is how heat flows in fluids, and involves the material itself moving, not just energy.
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Description
Learn about the concept of heat flow, its relation to energy, and how it is measured. Discover the different types of heat flow and how they work.
