heat energy mr. skirbst physical science topic 08
TRANSCRIPT
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Heat Energy
Mr. SkirbstPhysical Science
Topic 08
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What is heat?
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What is heat?
- It is the energy involved in the internal motion of particles
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How does heat “move”?
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How does heat “move”?Heat is always
transferred (moved) fromareas of high energy (warm)to areas of low energy (cool)
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3 Types of Heat Transfer
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3 Types of Heat Transfer
1. Conduction- transfer through direct contact (ex. hand on window)
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Conductor – transfers heat well (ex. metal)
Insulator – does not transfer heat well (ex. styrofoam)
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3 Types of Heat Transfer
2. Convection – transfer through a liquid or gas
(ex. boiling water or atmosphere)
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3 Types of Heat Transfer
3. Radiation – transfer through empty space (vacuum)
(ex. energy from sun, infrared rays from a fire)
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How is Heat Measured?
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How is Heat Measured?
Temperature – measures the average kinetic energy (energy
of motion) of molecules
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How is Heat Measured?
Thermometer – instrument used to measure temperature
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What are the three (3) temperature scales?
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What are the three (3) temperature scales?
1. Fahrenheit – based on an ice/salt mixture and body temperature
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What are the three (3) temperature scales?
2. Celsius – based on freezing and boiling points of water
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What are the three (3) temperature scales?
3. Kelvin – based on absolute zero (point at which all molecular motion stops)
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Comparisons:
Boiling water
Body temperature
Freezing water
Absolute Zero
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What is the unit of heat?
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What is the unit of heat?
Calorie – unit of heat
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What is the unit of heat?
calorie – the heat energy needed to raise the
temperature of 1 gram of water 1 degree Celsius
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What is specific heat?
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What is specific heat?
Specific heat – ability of a substance to absorb heat
energy
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What is specific heat?
Specific heat – number of calories needed to raise the
temperature of 1 gram of water 1 degree Celsius
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What is specific heat?
Specific heat of WATER =
1.00 cal/goC
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Calculating heat energy
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Calculating heat energy
Calorimeter – device used to measure heat gain / loss
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Calorimeter
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Heat Equation
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Lab Activity
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