In which of the following will a piece of iron weigh most?

A. in air

B. in an atmosphere of oxygen

C. in an atmosphere of CO2

D. in vacuum

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  6. Which of the following sets of elementary particles have nearly equal masses?
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  21. Heat transfer
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  29. Every action has an equal and opposite reaction is Newton's law of Motion
  30. Changing of one element into another element is known as