Heat Energy. I. Conduction - Transfer of thermal energy by direct contact Always from a solid hot object to a solid cold object Takes place in solid,

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Presentation transcript:

Heat Energy

I. Conduction - Transfer of thermal energy by direct contact Always from a solid hot object to a solid cold object Takes place in solid, liquid or gases Example:A metal spoon inside a saucepan gets hot while a saucepan is getting heated. If you were the chef in this picture and had to stir the contents for 20 minutes non-stop while on high heat – which type of spoon would you want to use?

Conductors Transfer heat easily more tightly packed the particles, the better it is as a conductor Most often Metals-metal spoon, metal pan, copper, iron, steel, silver

Insulators  does not allow heat to move easily through them  wood, plastic, glass, fiberglass, air, Styrofoam ·double pane windows (air between 2 panes of glass)

Insulation R-value-rates insulation (higher number best) R-1 R-16 R-20

Energy Vocabulary absorbers-take in the energy reflectors-reflect the energy emitters-good absorbers that release energy later dark and dull materials absorb light and shiny materials reflect

II. Convection - Transfer of thermal energy in fluids – anything that flows Always between liquids and gases Example: hot air balloon, wind, ocean & air currents, home heating, all the soup in a pot becoming warm warmer fluids (less dense) rise, buoyant convection cooler fluids (more dense) sink wearing sweater keeps the heat from being taken away from the body

III. Radiation - Transfer of thermal energy through waves. Electromagnetic waves-light, ultraviolet rays, x-rays, infrared rays Travels though gas and no air (vacuum) (outer space) Colors reflect waves differently. Black absorbs, White reflects Example: sun’s energy, microwaves and radio waves infrared light bulbs, person warmed by a fire.

What is specific heat? the amount of energy needed to raise 1 gram of a substance 1°C in temperature the lower the specific heat number the quicker it heats up or cools down water has a high specific heat, metals have a low specific heat specific heat of water is always 1.00cal/g·C° If in joules it is 4.2 J/g·C˚ the property of a substance that tells us how much the temperature goes up when a given amount of heat is added

Formula to calculate specific heat: Heat gained or lost = Mass X Change in Temperature X Specific Heat Q = (m)(ΔT)(Cp) Q = heat gained or lost (calories or joules or BTUs) m = mass (grams) ΔT = change in Temperature in °C (final temp – initial temp) Cp = Specific Heat (cal/g°C) or (J/g·C˚)

If the specific heat of copper (Cu) is 0.09cal/g°C, how much heat is needed to raise the temperature of 5 grams of copper by 10°C? Step 1 Read the problem. Draw a picture. Step 2Write down what you know. What are you trying to find? Step 4Substitute the numbers. Solve. Box Answer with units. Step 3Set up the formula. Cp= M = ΔT = 5g 10°C 0.09cal/g°C FormulaSubstituteAnswer Q = (m)(ΔT)(Cp) Q = Q = (5g)(10°C)(0.09cal/g°C)Q =4.5cal 4.5cal