Today we reviewed and had a practice quiz on unit conversions with quantities and scientific notation . Unit such as gram(g), meter(m), liter(L), and second(s) can be convert it into Tera, Giga,and etc... For example, Tera gram, Giga meter, or Milli second.
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For example, if you want to convert 4 m into mega meter, then first you should know how big mega meter is. At left chart, it said Giga is 109 greater
than meter. So, equation should be.....................4m×Gm/109m
Always unit that you want to convert into should
be at the top of fraction and unit you want to get
rid of should be at the bottom. meters cancel ea-
ch other out ( meter divide by meter is nothing)
then equation becomes.....................................
4×Gm/109 right? then 4 times Gm is 4 Gm
and now you have the answer 4Gm/109
or 4Gm/10000000000 or 0.000000004
But writing 0.000000004 Gm is too long, so
we use scientific notation
0.000000004 Gm is 4×109 Gm in scientific
notation. When you actually
calculate 4×109
Gm is same as 0.000000004 Gm. But it just
shorter
posted by Nick kim
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