Mr. Skirbst Physical Science Topic 08

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Presentation transcript:

Mr. Skirbst Physical Science Topic 08 Heat Energy Mr. Skirbst Physical Science Topic 08

What is heat?

It is the energy involved in the internal motion of particles What 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 (ex Conductor – transfers heat well (ex. metal) Insulator – does not transfer heat well (ex. styrofoam)

2. Convection – transfer through a liquid or gas 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?

How is Heat Measured? Temperature – measures the average kinetic energy (energy of motion) of molecules

Thermometer – instrument used to measure temperature How 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 water Absolute 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 energy 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

Specific heat of WATER = 1.00 cal/goC What is specific heat? Specific heat of WATER = 1.00 cal/goC

Calculating heat energy

Calculating heat energy Calorimeter – device used to measure heat gain / loss

Calorimeter

Heat Equation

Lab Activity