Chem Notes 083010 - CHAPTER 1 CONTINUED SI UNITS By length...

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CHAPTER 1: CONTINUED SI UNITS : By length, the standard unit is a Meter, which is a little longer than a yard. Mass—SI standard unit is a kilogram, shortened to a kg —mass is consistent, even when being moved around its mass stays the same —different than weight, which changes based on gravity. Time—SI standard unit is seconds Temperature—SI standard unit is Kelvin—temperature is defined as average heat energy, and cold is just an absence of heat (not opposites, just different ends of the scale) --heat moves from areas of high heat to low heat --within heat, can also use Fahrenheit (in America) or Celsius (everywhere else) --based on the freezing and boiling point of water --water freezes at 32 degrees Fahrenheit, and boils at 212 degrees --By Celsius, water freezes at 0 degrees and boils at 100. --there are 1.8 degrees Fahrenheit within 1 degree Celsius, and the conversion is o F=1.8 o C+ 32 --Kelvin’s freezing point is 273.15, and boiling point is 373.15. Hence on the same scale as
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