Heat is a flow of energy due to temperature differences

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Presentation transcript:

Heat is a flow of energy due to temperature differences Temperature and Heat Heat is a flow of energy due to temperature differences

Temperature Depends on Particle Movement! All matter is made up of atoms that are moving…even solid objects have atoms that are vibrating. The motion from the atoms gives the object energy.

The Kinetic Theory of Matter All of the particles that make up matter are constantly in motion Solid= vibrating atoms Liquid= flowing atoms Gas= move freely Plasma= move incredibly fast and freely www.nasa.gov

Temperature The Measure of the average kinetic energy of all the particles in the object The atoms mass and speed determine the temperature of the object cse.ssl.berkeley.edu

Temperature Temperature is measured in units called degrees (oC,F,K) Fahrenheit: Water freezes 32oF and boils at 212oF Celsius: Water freezes at 0oC and boils at 100oC www.germes-online.com

How does a Thermometer Work? The thermometer can measure temperature because the substance of the liquid inside always expands (increases) or contracts (decreases) by a certain amount due to a change in temperature.

(Reproduced by permission of Thermal Expansion All gases, liquids, and most solids expand when their temperature increases. This is why bridges are built with short segments with small breaks to allow for expansion Joints such as this one are used in bridges to accommodate thermal expansion. (Reproduced by permission of JLM Visuals)

Energy Flows from Warmer to Cooler Objects Heat: the flow of energy from an object at a higher temperature to an object at a lower temperature. Thermal Energy: total random kinetic energy of particles in an object.