Temperature How hot or cold something is. What make something hot?

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Presentation transcript:

Temperature How hot or cold something is. What make something hot? Particles that me up matter are in constant motion They have kinetic energy When you heat something the particles move faster Temperature measures average KE

Temperature Measured with thermometers Most materials expand when heated. That is how most thermometers work Liquid thermometers have a large bulb hooked to a narrow tube. When the liquid expands it rises up the tube. Won’t work if too hot or cold

Thermometers Metals expand when heated Different metals expand different amounts Hook two metals together to make a thermometer that turns Bimetallic Thermometers Iron Copper Cold Hot

Thermometers Bimetallic thermometers are used in thermostats Digital thermometers use the fact that electricity conducts differently at different temperatures.

Temperature As the temperature get lower the molecules move slower Kinetic energy goes down Lowest possible temperature would be when molecules stop moving Absolute zero

Temperature Scales Three different ones get used Fahrenheit- the one we use Celsius- metric standard Kelvin- starts at absolute zero but same degree size as Celsius

Converting Temperature F = 9 C + 32 5 K = C + 273 Water freezes at 32°F, what is this in Celsius? In Kevin? Water boils at 100°C. What is this in Fahrenheit? In Kelvin?

0⁰C 32⁰F 273 K

100⁰C 212⁰F 373 K 0⁰C 32⁰F 273 K

100⁰C 212⁰F 373 K 0⁰C 32⁰F 273 K -273⁰C -492⁰F 0 K

Conversion Practice Body temperature is 98.6°F, what is this in Celsius? In Kelvin? Methanol boils at 75°C, what is this in Fahrenheit?, in Kelvin? Lead melts at 600 K, what is this in Celsius? In Fahrenheit?

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