Element abundance on earth's crust

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The discussion focuses on defining the units for measuring the abundance of elements in the Earth's crust, specifically using parts per billion (ppb) by weight. It clarifies that one ppb represents one pound of an element per billion pounds of crust or one gram per billion grams. The units effectively cancel out, leading to a dimensionless ratio that expresses the concentration of elements, such as silicon, in the Earth's crust. This understanding is crucial for accurately interpreting geological data and element distribution.
Godwin Kessy
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May anyone help me on how to define the units used to define the abundance of elements on Earth's crust "It's written ppb(parts per billion by weight)"
I really fail to define that!
 
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One ppb is one pound per billion pounds or one gram per billion grams. There are no units since they cancel.

ie. [STRIKE]pounds[/STRIKE] of silicon/billion [STRIKE]pounds[/STRIKE] crust = ppb silicon in Earth's crust
 

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