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Questions and Answers
What is the unit of measurement for heat energy?
What is the unit of measurement for heat energy?
Which of the following statements about heat transfer is true?
Which of the following statements about heat transfer is true?
What is the primary factor that determines the temperature of an object?
What is the primary factor that determines the temperature of an object?
Which of the following examples illustrates the difference between heat and temperature?
Which of the following examples illustrates the difference between heat and temperature?
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What is the unit of measurement for temperature?
What is the unit of measurement for temperature?
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What is the direction of heat transfer if heat moves from the hotter to cooler areas?
What is the direction of heat transfer if heat moves from the hotter to cooler areas?
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What is the same for Beaker 1 and Beaker 2 in the diagram?
What is the same for Beaker 1 and Beaker 2 in the diagram?
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Which of the following statements is true about the particles in a substance?
Which of the following statements is true about the particles in a substance?
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What is the primary source of thermal energy in a substance?
What is the primary source of thermal energy in a substance?
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Which side of the diagram shows more heat energy?
Which side of the diagram shows more heat energy?
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Study Notes
Heat Transfer
- Heat travels directly and quickly to cooler objects nearby, including nearby gas or liquid particles (atoms or molecules).
- Heat can be felt through direct contact, such as Carlo feeling the heat on his hands when sitting close to the fire.
Conduction
- Conduction is the process of thermal transfer within an object or between a hot object and a cooler object when they come in direct contact.
- Heat is transferred by increasing the motion of particles in solid objects, happening best in solids, especially metals.
- Although conduction can occur in liquids and gases, it is much slower than in solids.
Convection
- Convection is the process of thermal transfer when the heat from a hot object or heat source is carried by the movement of a heated liquid or gas, such as water or air.
- The heated liquid or gas rises, carrying the heat in its particles.
Radiation
- Radiation is the process of thermal transfer through infrared electromagnetic waves.
- This transfer of heat does not require a substance, or medium, to carry the heat energy.
- Heat always flows from a higher-temperature object to a lower-temperature object.
Heat and Temperature
- Heat is an energy, measured in units of energy—joules (J) or calories (cal).
- Temperature is a measure of the average kinetic energy of particles in an object or system, indicating how hot or cold an object or system is.
- Temperature represents the intensity of thermal energy present in a substance, measured in units that show intensity—degrees Celsius (°C), degrees Fahrenheit (°F), or Kelvins (K).
Key Concepts
- The three ways that heat can be transferred from one place to another are conduction, convection, and radiation.
- Heat is transferred when particles move and collide, producing thermal energy.
- Heat energy is measured in units of energy, while temperature is measured in units that show intensity.
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Description
Learn about heat transfer through conduction, where heat travels directly to cooler objects nearby, including gas or liquid particles. This quiz is based on a scenario where three friends experience heat from an open fireplace.
