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Temperature

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

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Temperature

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  1. 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

  2. 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

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

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

  5. 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

  6. 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

  7. 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?

  8. 273 K 0⁰C 32⁰F

  9. 373 K 100⁰C 212⁰F 273 K 0⁰C 32⁰F

  10. 373 K 0 K 100⁰C -273⁰C 212⁰F -492⁰F 273 K 0⁰C 32⁰F

  11. 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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