Energy Notes 2.

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Presentation transcript:

Energy Notes 2

Heat Heat also called infrared (I.R.) radiation Longer wavelength than light! Heat is energy measured in joules A heat SOURCE contains more heat than a heat SINK and is higher temperature! Heat moves from source to sink!

Temperature Measures the average kinetic energy of the molecules of a substance More heat = higher temperature Thermometers use 3 scales to measure temperature: Celsius (C) Fahrenheit (F) Kelvin (K)

Temperature Scales ESRT p 13

Specific Heat Amount of heat needed to be absorbed by a substance to raise its temp. 1oC High specific heat = substance warms up s-l-o-w-l-y…. Low specific heat= substance warms up quickly! A good absorber is a good radiator ESRT p. 1: Charts to answer questions…

Phase Changes Solid to liquid= melting Liquid to vapor (gas) = vaporization The substance GAINS HEAT with both! Vapor  liquid = condensation Liquid  solid = freezing/solidification The substance LOSES HEAT with both! Condensation Video Phase Changes Video

Check the box which describes whether energy is gained or lost for each process. Process Energy Gained Energy Lost Condensation Evaporation Melting Solidification

Water warms very slowly compared to other natural substances. Why? Heat Summary Water warms very slowly compared to other natural substances. Why? HIGH specific heat Does water also COOL slowly? Why? Poor absorber = poor radiator Sand/soil warms up quickly! Why? LOW spec. heat, rough texture, dark color Does the sand/soil COOL quickly? Good absorber = good radiator Where at the beach is it warmer when the sun is out? At night?