TEMPERATURE http://www.electroschematics.com/ http://www.photographymad.com TEMPERATURE http://sos.noaa.gov.

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Presentation transcript:

TEMPERATURE http://www.electroschematics.com/ http://www.photographymad.com TEMPERATURE http://sos.noaa.gov

What scales are used to measure TEMPERATURE?

TEMPERATURE SCALES Fahrenheit scale http://intermath.coe.uga.edu/dictnary/images/miscell/frnthrmtr.gif Invented in 1724 Named after German physicist, Daniel Gariel Fahrenheit Defined in terms of water: freezes at 32°F boils at 212°F (at 101.32 kPa) Still used in USA and its territories

TEMPERATURE SCALES Celsisus scale http://intermath.coe.uga.edu/dictnary/images/miscell/frnthrmtr.gif Invented in 1742 Named after Swedish astronomer, Anders Celsius Defined in terms of water: freezes at 0°C boils at 100°C (at 101.32 kPa) Used worldwide except when Fahrenheit scale is predominant

Converting between °F→°C & °C→°F http://nauticajonkepa.files.wordpress.com °F to °C Subtract 32 Multiply by 5 Divide by 9 °C to °F Multiply by 9 Divide by 5 Add 32 98.6 °F 98.6 – 32 = 56.6 66.6* 5 = 333 333 / 9 = 37 So, 98.6 °F = 37 °C 100 °C 100 * 9 = 900 900 / 5 = 180 180 + 32 = 212 So, 100 °C = 212 °F

For what types of measurements are the Fahrenheit and Celsisus scales usually used? Weather forecasts Baking & cooking Clothes washing Computer diagnostics Health – fever or no fever? Air temperature Oven or Food temperature Water temperature CPU temperature Body temperature

What is the “layman‘s” definition of temperature? Temperature is a measure of how HOT or COLD something is.

What is the “scientist‘s” definition of temperature? http://imshopping.rediff.com Temperature refers to the kinetic energy of a substance‘s moving particles. ↓ temperature = slower movement ↑ temperature = faster movement

THE SPEAKER SAID “zero degrees kelvin (0°K)” – THIS IS INCORRECT INSTEAD WE SAY “zero kelvin (0 K)”

Temperature scales Kelvin scale http://www.differencebetween.info Invented in 1848 Named after British engineer and physicist, William Thomson (1st Baron Kelvin) Defined in terms of absolute zero which is the same for all substances 0 K = - 273.15°C Kelvin is an SI base unit