APES Formulas and Units

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Environmental Science

AP Environmental Science

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11 Terms

1
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Percent Change/Growth Rate (As a percentage)

[ (Final Value - Original Value)/Original Value ] * 100

2
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Rule of 70

70/Growth Rate%

3
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Population Growth (As a percentage)

[ (Births + Immigrations) - (Deaths + Emigrations) / Population Size ] * 100

4
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Efficiency (As a percentage)

Work output/Input * 100

5
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Half Life

Original Amount * (0.5)^x, where x = the number of half lives given

6
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Micro-

1/1,000,000

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Mili-

1/1,000

8
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Centi-

1/100

9
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Deci-

1/10

10
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Kilo-

1,000

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Mega-

1,000,000