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Heat Energy Mr. Skirbst Physical Science Topic 08
What is heat?
-It is the energy involved in the internal motion of particles
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
1.Conduction - transfer through direct contact (ex. hand on window)
Conductor – transfers heat well (ex. metal) Insulator – does not transfer heat well (ex. styrofoam)
3 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?
Temperature – measures the average kinetic energy (energy of motion) of molecules
How is Heat Measured? Thermometer – instrument used to measure temperature
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 water Absolute Zero
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 energy
What is specific heat? Specific heat – number of calories needed to raise the temperature of 1 gram of water 1 degree Celsius
What is specific heat? Specific heat of WATER = 1.00 cal/g o C
Calculating heat energy
Calorimeter – device used to measure heat gain / loss
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