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Mr. Skirbst Physical Science Topic 08Heat Energy Mr. Skirbst Physical Science Topic 08
What is heat?
It is the energy involved in the internal motion of particlesWhat is heat? It is the energy involved in the internal motion of particles
How does heat “move”?
How does heat “move”? Heat is always transferred (moved) from areas of high energy (warm) to areas of low energy (cool)
3 Types of Heat Transfer
3 Types of Heat Transfer Conduction - transfer through direct contact (ex. hand on window)
Conductor – transfers heat well (exConductor – transfers heat well (ex. metal) Insulator – does not transfer heat well (ex. styrofoam)
2. Convection – transfer through a liquid or gas3 Types of Heat Transfer 2. Convection – transfer through a liquid or gas (ex. boiling water or atmosphere)
3 Types of Heat Transfer 3. Radiation – transfer through empty space (vacuum) (ex. energy from sun, infrared rays from a fire)
How is Heat Measured?
How is Heat Measured? Temperature – measures the average kinetic energy (energy of motion) of molecules
Thermometer – instrument used to measure temperatureHow is Heat Measured? Thermometer – instrument used to measure temperature
What are the three (3) temperature scales?
What are the three (3) temperature scales?1. Fahrenheit – based on an ice/salt mixture and body temperature
What are the three (3) temperature scales?2. Celsius – based on freezing and boiling points of water
What are the three (3) temperature scales?3. Kelvin – based on absolute zero (point at which all molecular motion stops)
Comparisons: Boiling water Body temperature Freezing waterAbsolute Zero
What is the unit of heat?
What is the unit of heat? Calorie – unit of heat
What is the unit of heat? calorie – the heat energy needed to raise the temperature of 1 gram of water 1 degree Celsius
What is specific heat?
Specific heat – ability of a substance to absorb heat energyWhat is specific heat? Specific heat – ability of a substance to absorb heat energy
What is specific heat? Specific heat – number of calories needed to raise the temperature of 1 gram of water 1 degree Celsius
Specific heat of WATER = 1.00 cal/goCWhat is specific heat? Specific heat of WATER = 1.00 cal/goC
Calculating heat energy
Calculating heat energyCalorimeter – device used to measure heat gain / loss
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Heat is a form of:. Everything in the universe has heat energy! Your BODY, your CAR…even ICE!
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