Chapter 14-Heat and Energy Temperature You know it as how “hot” or “cold” something is It is also a measure of how fast the particles inside of something.

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Presentation transcript:

Chapter 14-Heat and Energy Temperature You know it as how “hot” or “cold” something is It is also a measure of how fast the particles inside of something move (KE) Measured with a thermometer Faster movement= high temp. Slower movement= low temp.

` Heat The amount of energy an object has Mass/size of object is an important variable Transfers(moves) from hot  cold (high  low)

Transfer of Heat/Energy Heat/energy moves from one location to another as a result of three methods: 1.Conduction -Movement of energy that takes place when objects TOUCH each other (solid  solid)

2. Convection Movement of energy in things that “flow” Takes place in air and water (gases and liquids) Hot=rise Cold=fall

3. Radiation Energy in the form of invisible waves Can travel through space (don’t need S,L,G)

All Three Forms Can Occur At Once

Why are most pots and pans metals? Conductors Materials that allow heat or electricity to pass through them (inside) Good conductors: metals

Why are most pot and pan handles NOT metal? Insulators Materials that do NOT allow heat or electricity to pass through them Good insulators: Styrofoam, plastic, rubber, gases Used to keep hot things hot and cold things cold

GAS??? -triple/double pane Krypton gas filled windows

Energy Efficient Homes Contain a variety of insulators to prevent heat loss in winter Also prevents heat entering in summer Saves you money

Conduction, Convection, Radiation and Your House

R-Value Measure of how well insulation stops heat flow Higher R-value= better stoppage Lower R-value= worse stoppage

Specific Heat A physical property that describes how well something ABSORBS heat energy The amount of heat needed to raise the temperature of a 1g of something 1 degree Celsius High value= heats/cools slowly Low value= heats/cools quickly

Specific heat explains our temperature changes of air and water on earth each year….. Specific Heat of air=.25 cal/g *C Jan. 23 rd, 1916 in Browning, Montana  44 degrees F Jan. 24 th, 1916 in Browning, Montana  -56 degrees F An air temp. change of 100 degrees in 24 hours!! Specific Heat of water= 1.0 cal/g *C Think about how long it takes lake, river, or ocean water to heat up in the spring, and how long it takes to cool down in fall Coastal Water Temperatures

Formula for Specific Heat How much heat would need to be added to 10 g of water to get the water’s temperature to increase 20 *C?

What’s the difference between conduction and specific heat?

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