Carbon dioxide is a gas which causes environmental concern because of the greenhouse effect.What is the approximate percentage (by volume) of CO2 in the atmosphere?
A) less than 0.1%
B) about 1%
C) about 10%
D) more than 20%
Correct Answer:
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Q2: The SI unit for pressure is the
A)atmosphere.
B)MM
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Q9: Pressure is defined as
A)force divided by unit
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Q16: A container filled with gas is connected
Q17: Which law does the equation, 
Q19: Which of the following is not equivalent
Q20: Which one of the following is not
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